7:21 a.m.
transparent huge pages are not used on vm and physical host.
But, can I enable hugepage memory on virtual machines but not on a physical machine?
For database running on vm, and it needs to config hugepage.
From: Strahil Nikolov <hunter86_bg(a)yahoo.com>
Sent: Saturday, September 25, 2021 5:32 PM
To: Tommy Sway <sz_cuitao(a)163.com>
Subject: Re: [ovirt-users] About the vm memory limit
It depends on the numa configuration of the host.
If you have 256G per CPU, it's best to stay into that range.
Also, consider disabling transparent huge pages on the host & VM.
Since 4.4 Regular Huge Pages (do not confuse them with THP) can be used on the
Hypervisors, while on 4.3 there were some issues but I can't provode any details.
Best Regards,
Strahil Nikolov
On Fri, Sep 24, 2021 at 6:40, Tommy Sway
<sz_cuitao(a)163.com <mailto:sz_cuitao@163.com> > wrote:
I would like to ask if there is any limit on the memory size of virtual machines, or
performance curve or something like that?
As long as there is memory on the physical machine, the more virtual machines the better?
In our usage scenario, there are many virtual machines with databases, and their memory
varies greatly.
For some virtual machines, 4G memory is enough, while for some virtual machines, 64GB
memory is needed.
I want to know what is the best use of memory for a virtual machine, since the virtual
machine is just a QEMU emulation process on a physical machine, and I worry that it is not
using as much memory as a physical machine. Understand this so that we can develop
guidelines for optimal memory usage scenarios for virtual machines.
Thank you!
_______________________________________________
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8:13 a.m.
New subject: About the vm memory limit
Transparent huge pages are enabled by default, so you need to stop them.
I would use huge pages on both host and VM, but theoretically it shouldn't be a
problem running a VM with enabled HugePages without configuring on Host.
Best Regards,
Strahil Nikolov
В събота, 25 септември 2021 г., 15:25:10 ч. Гринуич+3, Tommy Sway
<sz_cuitao(a)163.com> написа:
transparent huge pages are not used on vm and physical host.
But, can I enable hugepage memory on virtual machines but not on a physical machine?
For database running on vm, and it needs to config hugepage.
From: Strahil Nikolov <hunter86_bg(a)yahoo.com> Sent: Saturday, September 25, 2021
5:32 PMTo: Tommy Sway <sz_cuitao(a)163.com>Subject: Re: [ovirt-users] About the vm
memory limit
It depends on the numa configuration of the host.
If you have 256G per CPU, it's best to stay into that range.
Also, consider disabling transparent huge pages on the host & VM.
Since 4.4 Regular Huge Pages (do not confuse them with THP) can be used on the
Hypervisors, while on 4.3 there were some issues but I can't provode any details.
Best Regards,
Strahil Nikolov
On Fri, Sep 24, 2021 at 6:40, Tommy Sway
<sz_cuitao(a)163.com> wrote:
I would like to ask if there is any limit on the memory size of virtual machines, or
performance curve or something like that?
As long as there is memory on the physical machine, the more virtual machines the
better?
In our usage scenario, there are many virtual machines with databases, and their memory
varies greatly.
For some virtual machines, 4G memory is enough, while for some virtual machines, 64GB
memory is needed.
I want to know what is the best use of memory for a virtual machine, since the virtual
machine is just a QEMU emulation process on a physical machine, and I worry that it is not
using as much memory as a physical machine. Understand this so that we can develop
guidelines for optimal memory usage scenarios for virtual machines.
Thank you!
_______________________________________________Users mailing list -- users(a)ovirt.orgTo
unsubscribe send an email to users-leave(a)ovirt.orgPrivacy Statement:
https://www.ovirt.org/privacy-policy.htmloVirt Code of Conduct:
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11:04 a.m.
New subject: 回复： Re: About the vm memory limit
https://docs.oracle.com/en/database/oracle/oracle-database/19/ladbi/disab...
https://access.redhat.com/solutions/1320153 (requires RH dev subscription or other type of
subscription) -> In short add 'transparent_hugepage=never' to the kernel
params
SLES11/12/15 -> https://www.suse.com/c/sles-1112-os-tuning-optimisation-guide-part-1/
Best Regards,Strahil Nikolov
On Mon, Sep 27, 2021 at 16:33, tommy<sz_cuitao(a)163.com> wrote: thank you!
and how to get the config info of Transparent huge pages and how to disable it？
发自我的华为手机
-------- 原始邮件 --------
发件人： Strahil Nikolov <hunter86_bg(a)yahoo.com>
日期： 2021年9月27日周一 21:13
收件人： 'users' <users(a)ovirt.org>, Tommy Sway <sz_cuitao(a)163.com>
主 题： Re: [ovirt-users] Re: About the vm memory limit
Transparent huge pages are enabled by default, so you need to stop them.
I would use huge pages on both host and VM, but theoretically it shouldn't be a
problem running a VM with enabled HugePages without configuring on Host.
Best Regards,
Strahil Nikolov
В събота, 25 септември 2021 г., 15:25:10 ч. Гринуич+3, Tommy Sway
<sz_cuitao(a)163.com> написа:
transparent huge pages are not used on vm and physical host.
But, can I enable hugepage memory on virtual machines but not on a physical machine?
For database running on vm, and it needs to config hugepage.
From: Strahil Nikolov <hunter86_bg(a)yahoo.com> Sent: Saturday, September 25, 2021
5:32 PMTo: Tommy Sway <sz_cuitao(a)163.com>Subject: Re: [ovirt-users] About the vm
memory limit
It depends on the numa configuration of the host.
If you have 256G per CPU, it's best to stay into that range.
Also, consider disabling transparent huge pages on the host & VM.
Since 4.4 Regular Huge Pages (do not confuse them with THP) can be used on the
Hypervisors, while on 4.3 there were some issues but I can't provode any details.
Best Regards,
Strahil Nikolov
On Fri, Sep 24, 2021 at 6:40, Tommy Sway
<sz_cuitao(a)163.com> wrote:
I would like to ask if there is any limit on the memory size of virtual machines, or
performance curve or something like that?
As long as there is memory on the physical machine, the more virtual machines the
better?
In our usage scenario, there are many virtual machines with databases, and their memory
varies greatly.
For some virtual machines, 4G memory is enough, while for some virtual machines, 64GB
memory is needed.
I want to know what is the best use of memory for a virtual machine, since the virtual
machine is just a QEMU emulation process on a physical machine, and I worry that it is not
using as much memory as a physical machine. Understand this so that we can develop
guidelines for optimal memory usage scenarios for virtual machines.
Thank you!
_______________________________________________Users mailing list -- users(a)ovirt.orgTo
unsubscribe send an email to users-leave(a)ovirt.orgPrivacy Statement:
https://www.ovirt.org/privacy-policy.htmloVirt Code of Conduct:
https://www.ovirt.org/community/about/community-guidelines/List Archives:
https://lists.ovirt.org/archives/list/users@ovirt.org/message/Y6XDOIMKCP4...
_______________________________________________
Users mailing list -- users(a)ovirt.org
To unsubscribe send an email to users-leave(a)ovirt.org
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List Archives:
https://lists.ovirt.org/archives/list/users@ovirt.org/message/3YHTUBAG42Y...
1:21 a.m.
New subject: 回复： Re: About the vm memory limit
What problem will appear if I use the default transparent huge page enabled mode for
physical hosts, but configure traditional huge page memory on the virtual machine for
database SGA ?
Or is it better to disable transparent huge page on physical machines and still use
traditional huge page memory on virtual machines?
Which one is prefer ?
From: users-bounces(a)ovirt.org <users-bounces(a)ovirt.org> On Behalf Of Strahil Nikolov
via Users
Sent: Tuesday, September 28, 2021 12:05 AM
To: tommy <sz_cuitao(a)163.com>; 'users' <users(a)ovirt.org>
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
https://docs.oracle.com/en/database/oracle/oracle-database/19/ladbi/disab...
https://access.redhat.com/solutions/1320153 (requires RH dev subscription or other type of
subscription) -> In short add 'transparent_hugepage=never' to the kernel
params
SLES11/12/15 -> https://www.suse.com/c/sles-1112-os-tuning-optimisation-guide-part-1/
Best Regards,
Strahil Nikolov
On Mon, Sep 27, 2021 at 16:33, tommy
<sz_cuitao(a)163.com <mailto:sz_cuitao@163.com> > wrote:
thank you!
and how to get the config info of Transparent huge pages and how to disable it？
发自我的华为手机
-------- 原始邮件 --------
发件人： Strahil Nikolov <hunter86_bg(a)yahoo.com <mailto:hunter86_bg@yahoo.com> >
日期： 2021年9月27日周一 21:13
收件人： 'users' <users(a)ovirt.org <mailto:users@ovirt.org> >, Tommy Sway
<sz_cuitao(a)163.com <mailto:sz_cuitao@163.com> >
主 题： Re: [ovirt-users] Re: About the vm memory limit
Transparent huge pages are enabled by default, so you need to stop them.
I would use huge pages on both host and VM, but theoretically it shouldn't be a
problem running a VM with enabled HugePages without configuring on Host.
Best Regards,
Strahil Nikolov
В събота, 25 септември 2021 г., 15:25:10 ч. Гринуич+3, Tommy Sway <sz_cuitao(a)163.com
<mailto:sz_cuitao@163.com> > написа:
transparent huge pages are not used on vm and physical host.
But, can I enable hugepage memory on virtual machines but not on a physical machine?
For database running on vm, and it needs to config hugepage.
From: Strahil Nikolov <hunter86_bg(a)yahoo.com <mailto:hunter86_bg@yahoo.com> >
Sent: Saturday, September 25, 2021 5:32 PMTo: Tommy Sway <sz_cuitao(a)163.com
<mailto:sz_cuitao@163.com> >Subject: Re: [ovirt-users] About the vm memory limit
It depends on the numa configuration of the host.
If you have 256G per CPU, it's best to stay into that range.
Also, consider disabling transparent huge pages on the host & VM.
Since 4.4 Regular Huge Pages (do not confuse them with THP) can be used on the
Hypervisors, while on 4.3 there were some issues but I can't provode any details.
Best Regards,
Strahil Nikolov
On Fri, Sep 24, 2021 at 6:40, Tommy Sway
<sz_cuitao(a)163.com <mailto:sz_cuitao@163.com> > wrote:
I would like to ask if there is any limit on the memory size of virtual machines, or
performance curve or something like that?
As long as there is memory on the physical machine, the more virtual machines the
better?
In our usage scenario, there are many virtual machines with databases, and their memory
varies greatly.
For some virtual machines, 4G memory is enough, while for some virtual machines, 64GB
memory is needed.
I want to know what is the best use of memory for a virtual machine, since the virtual
machine is just a QEMU emulation process on a physical machine, and I worry that it is not
using as much memory as a physical machine. Understand this so that we can develop
guidelines for optimal memory usage scenarios for virtual machines.
Thank you!
_______________________________________________Users mailing list -- users(a)ovirt.orgTo
<mailto:users@ovirt.orgTo> unsubscribe send an email to
users-leave(a)ovirt.orgPrivacy <mailto:users-leave@ovirt.orgPrivacy> Statement:
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_______________________________________________
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To unsubscribe send an email to users-leave(a)ovirt.org <mailto:users-leave@ovirt.org>
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List Archives:
https://lists.ovirt.org/archives/list/users@ovirt.org/message/3YHTUBAG42Y...
2:39 a.m.
New subject: 回复： Re: About the vm memory limit
I think that if you run VMs with Databases, you must disable transparent huge pages on
Hypervisour level and on VM level. Yet, if you wish you can use regular huge pages on VM
level.
Best Regards,
Strahil Nikolov
В вторник, 28 септември 2021 г., 09:21:09 ч. Гринуич+3, Tommy Sway
<sz_cuitao(a)163.com> написа:
What problem will appear if I use the default transparent huge page enabled mode for
physical hosts, but configure traditional huge page memory on the virtual machine for
database SGA ?
Or is it better to disable transparent huge page on physical machines and still use
traditional huge page memory on virtual machines?
Which one is prefer ?
From: users-bounces(a)ovirt.org <users-bounces(a)ovirt.org> On Behalf Of Strahil Nikolov
via Users
Sent: Tuesday, September 28, 2021 12:05 AM
To: tommy <sz_cuitao(a)163.com>; 'users' <users(a)ovirt.org>
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
https://docs.oracle.com/en/database/oracle/oracle-database/19/ladbi/disab...
https://access.redhat.com/solutions/1320153 (requires RH dev subscription or other type of
subscription) -> In short add 'transparent_hugepage=never' to the kernel
params
SLES11/12/15 -> https://www.suse.com/c/sles-1112-os-tuning-optimisation-guide-part-1/
Best Regards,
Strahil Nikolov
> On Mon, Sep 27, 2021 at 16:33, tommy
> <sz_cuitao(a)163.com> wrote:
> thank you!
>
> and how to get the config info of Transparent huge pages and how to disable it？
>
>
>
>
>
> 发自我的华为手机
>
>
> -------- 原始邮件 --------
> 发件人： Strahil Nikolov <hunter86_bg(a)yahoo.com>
> 日期： 2021年9月27日周一 21:13
> 收件人： 'users' <users(a)ovirt.org>, Tommy Sway <sz_cuitao(a)163.com>
> 主 题： Re: [ovirt-users] Re: About the vm memory limit
>> Transparent huge pages are enabled by default, so you need to stop them.I would
use huge pages on both host and VM, but theoretically it shouldn't be a problem
running a VM with enabled HugePages without configuring on Host.Best Regards,Strahil
NikolovВ събота, 25 септември 2021 г., 15:25:10 ч. Гринуич+3, Tommy Sway
<sz_cuitao(a)163.com> написа: transparent huge pages are not used on vm and physical
host. But, can I enable hugepage memory on virtual machines but not on a physical
machine?For database running on vm, and it needs to config hugepage. From: Strahil
Nikolov <hunter86_bg(a)yahoo.com> Sent: Saturday, September 25, 2021 5:32 PMTo: Tommy
Sway <sz_cuitao(a)163.com>Subject: Re: [ovirt-users] About the vm memory limit It
depends on the numa configuration of the host. If you have 256G per CPU, it's best to
stay into that range. Also, consider disabling transparent huge pages on the host &
VM. Since 4.4 Regular Huge Pages (do not confuse them with THP) can be used on the
Hypervisors, while on 4.3 there were some issues but I can't provode any details. Best
Regards,Strahil Nikolov> On Fri, Sep 24, 2021 at 6:40, Tommy Sway>
<sz_cuitao(a)163.com> wrote:> I would like to ask if there is any limit on the
memory size of virtual machines, or performance curve or something like that?> As long
as there is memory on the physical machine, the more virtual machines the better?>
> In our usage scenario, there are many virtual machines with databases, and their
memory varies greatly. > For some virtual machines, 4G memory is enough, while for some
virtual machines, 64GB memory is needed.> > I want to know what is the best use of
memory for a virtual machine, since the virtual machine is just a QEMU emulation process
on a physical machine, and I worry that it is not using as much memory as a physical
machine. Understand this so that we can develop guidelines for optimal memory usage
scenarios for virtual machines.> > Thank you!> > >
_______________________________________________Users mailing list -- users(a)ovirt.orgTo
unsubscribe send an email to users-leave(a)ovirt.orgPrivacy Statement:
https://www.ovirt.org/privacy-policy.htmloVirt Code of Conduct:
https://www.ovirt.org/community/about/community-guidelines/List Archives:
https://lists.ovirt.org/archives/list/users@ovirt.org/message/Y6XDOIMKCP4...
mailing list -- users(a)ovirt.orgTo unsubscribe send an email to
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Code of Conduct: https://www.ovirt.org/community/about/community-guidelines/List Archives:
https://lists.ovirt.org/archives/list/users@ovirt.org/message/3YHTUBAG42Y...
9:31 p.m.
New subject: 回复： Re: About the vm memory limit
From the Oracle OLVM support:
Configuring the Hugepages for guest VMs should be suffice, however, it needs the KVM hosts
too configured with the Hugepages.
Since, if it not you may end with issues while staring the guest VMs.
I really don't know what to do now.
-----Original Message-----
From: users-bounces(a)ovirt.org <users-bounces(a)ovirt.org> On Behalf Of Strahil Nikolov
via Users
Sent: Tuesday, September 28, 2021 3:39 PM
To: 'users' <users(a)ovirt.org>; Tommy Sway <sz_cuitao(a)163.com>
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
I think that if you run VMs with Databases, you must disable transparent huge pages on
Hypervisour level and on VM level. Yet, if you wish you can use regular huge pages on VM
level.
Best Regards,
Strahil Nikolov
В вторник, 28 септември 2021 г., 09:21:09 ч. Гринуич+3, Tommy Sway
<sz_cuitao(a)163.com> написа:
What problem will appear if I use the default transparent huge page enabled mode for
physical hosts, but configure traditional huge page memory on the virtual machine for
database SGA ?
Or is it better to disable transparent huge page on physical machines and still use
traditional huge page memory on virtual machines?
Which one is prefer ?
From: users-bounces(a)ovirt.org <users-bounces(a)ovirt.org> On Behalf Of Strahil Nikolov
via Users
Sent: Tuesday, September 28, 2021 12:05 AM
To: tommy <sz_cuitao(a)163.com>; 'users' <users(a)ovirt.org>
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
https://docs.oracle.com/en/database/oracle/oracle-database/19/ladbi/disab...
https://access.redhat.com/solutions/1320153 (requires RH dev subscription or other type of
subscription) -> In short add 'transparent_hugepage=never' to the kernel
params
SLES11/12/15 -> https://www.suse.com/c/sles-1112-os-tuning-optimisation-guide-part-1/
Best Regards,
Strahil Nikolov
On Mon, Sep 27, 2021 at 16:33, tommy <sz_cuitao(a)163.com>
wrote:
thank you!
and how to get the config info of Transparent huge pages and how to
disable it？
发自我的华为手机
-------- 原始邮件 --------
发件人： Strahil Nikolov <hunter86_bg(a)yahoo.com>
日期： 2021年9月27日周一 21:13
收件人： 'users' <users(a)ovirt.org>, Tommy Sway <sz_cuitao(a)163.com>
主 题： Re: [ovirt-users] Re: About the vm memory limit
> Transparent huge pages are enabled by default, so you need to stop
> them.I would use huge pages on both host and VM, but theoretically it
> shouldn't be a problem running a VM with enabled HugePages without
> configuring on Host.Best Regards,Strahil NikolovВ събота, 25
> септември 2021 г., 15:25:10 ч. Гринуич+3, Tommy Sway
> <sz_cuitao(a)163.com> написа: transparent huge pages are not used on vm
> and physical host. But, can I enable hugepage memory on virtual
> machines but not on a physical machine?For database running on vm,
> and it needs to config hugepage. From: Strahil Nikolov
> <hunter86_bg(a)yahoo.com> Sent: Saturday, September 25, 2021 5:32 PMTo:
> Tommy Sway <sz_cuitao(a)163.com>Subject: Re: [ovirt-users] About the vm
> memory limit It depends on the numa configuration of the host. If you
> have 256G per CPU, it's best to stay into that range. Also, consider
> disabling transparent huge pages on the host & VM. Since 4.4 Regular
> Huge Pages (do not confuse them with THP) can be used on the
> Hypervisors, while on 4.3 there were some issues but I can't provode
> any details. Best Regards,Strahil Nikolov> On Fri, Sep 24, 2021 at
> 6:40, Tommy Sway> <sz_cuitao(a)163.com> wrote:> I would like to ask if
> there is any limit on the memory size of virtual machines, or
> performance curve or something like that?> As long as there is memory
> on the physical machine, the more virtual machines the better?> > In
> our usage scenario, there are many virtual machines with databases,
> and their memory varies greatly. > For some virtual machines, 4G
> memory is enough, while for some virtual machines, 64GB memory is
> needed.> > I want to know what is the best use of memory for a
> virtual machine, since the virtual machine is just a QEMU emulation
> process on a physical machine, and I worry that it is not using as
> much memory as a physical machine. Understand this so that we can
> develop guidelines for optimal memory usage scenarios for virtual
> machines.> > Thank you!> > >
> _______________________________________________Users mailing list --
> users(a)ovirt.orgTo unsubscribe send an email to
> users-leave(a)ovirt.orgPrivacy Statement:
> https://www.ovirt.org/privacy-policy.htmloVirt Code of Conduct:
> https://www.ovirt.org/community/about/community-guidelines/List
> Archives:
> https://lists.ovirt.org/archives/list/users@ovirt.org/message/Y6XDOIM
> KCP4JEJF7M5DLJ33U2ENJKGAN/___________________________________________
> ____Users mailing list -- users(a)ovirt.orgTo unsubscribe send an email
> to users-leave(a)ovirt.orgPrivacy Statement:
> https://www.ovirt.org/privacy-policy.htmloVirt Code of Conduct:
> https://www.ovirt.org/community/about/community-guidelines/List
> Archives:
> https://lists.ovirt.org/archives/list/users@ovirt.org/message/3YHTUBA
> G42YRNEUCWG4DF5TEP2I22DMH/
_______________________________________________
Users mailing list -- users(a)ovirt.org
To unsubscribe send an email to users-leave(a)ovirt.org Privacy Statement:
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4:39 a.m.
New subject: 回复： Re: About the vm memory limit
If you are on 4.3 -> disable transparent hugepages both Hypervisor and VM.If you are
using 4.4 -> disable transparent hugepages and also cobfigure regular huge pages.
Best Regards,Strahil Nikolov
On Wed, Sep 29, 2021 at 5:34, Tommy Sway<sz_cuitao(a)163.com> wrote: From the
Oracle OLVM support:
Configuring the Hugepages for guest VMs should be suffice, however, it needs the KVM hosts
too configured with the Hugepages.
Since, if it not you may end with issues while staring the guest VMs.
I really don't know what to do now.
-----Original Message-----
From: users-bounces(a)ovirt.org <users-bounces(a)ovirt.org> On Behalf Of Strahil Nikolov
via Users
Sent: Tuesday, September 28, 2021 3:39 PM
To: 'users' <users(a)ovirt.org>; Tommy Sway <sz_cuitao(a)163.com>
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
I think that if you run VMs with Databases, you must disable transparent huge pages on
Hypervisour level and on VM level. Yet, if you wish you can use regular huge pages on VM
level.
Best Regards,
Strahil Nikolov
В вторник, 28 септември 2021 г., 09:21:09 ч. Гринуич+3, Tommy Sway
<sz_cuitao(a)163.com> написа:
What problem will appear if I use the default transparent huge page enabled mode for
physical hosts, but configure traditional huge page memory on the virtual machine for
database SGA ?
Or is it better to disable transparent huge page on physical machines and still use
traditional huge page memory on virtual machines?
Which one is prefer ?
From: users-bounces(a)ovirt.org <users-bounces(a)ovirt.org> On Behalf Of Strahil Nikolov
via Users
Sent: Tuesday, September 28, 2021 12:05 AM
To: tommy <sz_cuitao(a)163.com>; 'users' <users(a)ovirt.org>
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
https://docs.oracle.com/en/database/oracle/oracle-database/19/ladbi/disab...
https://access.redhat.com/solutions/1320153 (requires RH dev subscription or other type of
subscription) -> In short add 'transparent_hugepage=never' to the kernel
params
SLES11/12/15 -> https://www.suse.com/c/sles-1112-os-tuning-optimisation-guide-part-1/
Best Regards,
Strahil Nikolov
On Mon, Sep 27, 2021 at 16:33, tommy <sz_cuitao(a)163.com>
wrote:
thank you!
and how to get the config info of Transparent huge pages and how to
disable it？
发自我的华为手机
-------- 原始邮件 --------
发件人： Strahil Nikolov <hunter86_bg(a)yahoo.com>
日期： 2021年9月27日周一 21:13
收件人： 'users' <users(a)ovirt.org>, Tommy Sway <sz_cuitao(a)163.com>
主 题： Re: [ovirt-users] Re: About the vm memory limit
> Transparent huge pages are enabled by default, so you need to stop
> them.I would use huge pages on both host and VM, but theoretically it
> shouldn't be a problem running a VM with enabled HugePages without
> configuring on Host.Best Regards,Strahil NikolovВ събота, 25
> септември 2021 г., 15:25:10 ч. Гринуич+3, Tommy Sway
> <sz_cuitao(a)163.com> написа: transparent huge pages are not used on vm
> and physical host. But, can I enable hugepage memory on virtual
> machines but not on a physical machine?For database running on vm,
> and it needs to config hugepage. From: Strahil Nikolov
> <hunter86_bg(a)yahoo.com> Sent: Saturday, September 25, 2021 5:32 PMTo:
> Tommy Sway <sz_cuitao(a)163.com>Subject: Re: [ovirt-users] About the vm
> memory limit It depends on the numa configuration of the host. If you
> have 256G per CPU, it's best to stay into that range. Also, consider
> disabling transparent huge pages on the host & VM. Since 4.4 Regular
> Huge Pages (do not confuse them with THP) can be used on the
> Hypervisors, while on 4.3 there were some issues but I can't provode
> any details. Best Regards,Strahil Nikolov> On Fri, Sep 24, 2021 at
> 6:40, Tommy Sway> <sz_cuitao(a)163.com> wrote:> I would like to ask if
> there is any limit on the memory size of virtual machines, or
> performance curve or something like that?> As long as there is memory
> on the physical machine, the more virtual machines the better?> > In
> our usage scenario, there are many virtual machines with databases,
> and their memory varies greatly. > For some virtual machines, 4G
> memory is enough, while for some virtual machines, 64GB memory is
> needed.> > I want to know what is the best use of memory for a
> virtual machine, since the virtual machine is just a QEMU emulation
> process on a physical machine, and I worry that it is not using as
> much memory as a physical machine. Understand this so that we can
> develop guidelines for optimal memory usage scenarios for virtual
> machines.> > Thank you!> > >
> _______________________________________________Users mailing list --
> users(a)ovirt.orgTo unsubscribe send an email to
> users-leave(a)ovirt.orgPrivacy Statement:
> https://www.ovirt.org/privacy-policy.htmloVirt Code of Conduct:
> https://www.ovirt.org/community/about/community-guidelines/List
> Archives:
> https://lists.ovirt.org/archives/list/users@ovirt.org/message/Y6XDOIM
> KCP4JEJF7M5DLJ33U2ENJKGAN/___________________________________________
> ____Users mailing list -- users(a)ovirt.orgTo unsubscribe send an email
> to users-leave(a)ovirt.orgPrivacy Statement:
> https://www.ovirt.org/privacy-policy.htmloVirt Code of Conduct:
> https://www.ovirt.org/community/about/community-guidelines/List
> Archives:
> https://lists.ovirt.org/archives/list/users@ovirt.org/message/3YHTUBA
> G42YRNEUCWG4DF5TEP2I22DMH/
_______________________________________________
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7:20 a.m.
New subject: 回复： Re: About the vm memory limit
I’am 4.3, but the memory of the VM and the SGA is large , 32GB, so the vm should set the
traditional hugepage for the database SGA.
I don't know how to set up a large page on a KVM host.
Because if I make it a traditional big page, how big should I make it? Will non-VM SGA
usage of many VMs be affected?
After all, not all memory used by QEMU needs to be HugePage, and traditional large page
memory needs to be used by specific code calls and is not transparent.
These are all questions.
From: users-bounces(a)ovirt.org <users-bounces(a)ovirt.org> On Behalf Of Strahil Nikolov
via Users
Sent: Wednesday, September 29, 2021 5:39 PM
To: Tommy Sway <sz_cuitao(a)163.com>; 'users' <users(a)ovirt.org>
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
If you are on 4.3 -> disable transparent hugepages both Hypervisor and VM.
If you are using 4.4 -> disable transparent hugepages and also cobfigure regular huge
pages.
Best Regards,
Strahil Nikolov
On Wed, Sep 29, 2021 at 5:34, Tommy Sway
<sz_cuitao(a)163.com <mailto:sz_cuitao@163.com> > wrote:
From the Oracle OLVM support:
Configuring the Hugepages for guest VMs should be suffice, however, it needs the KVM hosts
too configured with the Hugepages.
Since, if it not you may end with issues while staring the guest VMs.
I really don't know what to do now.
-----Original Message-----
From: users-bounces(a)ovirt.org <mailto:users-bounces@ovirt.org>
<users-bounces(a)ovirt.org <mailto:users-bounces@ovirt.org> > On Behalf Of
Strahil Nikolov via Users
Sent: Tuesday, September 28, 2021 3:39 PM
To: 'users' <users(a)ovirt.org <mailto:users@ovirt.org> >; Tommy Sway
<sz_cuitao(a)163.com <mailto:sz_cuitao@163.com> >
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
I think that if you run VMs with Databases, you must disable transparent huge pages on
Hypervisour level and on VM level. Yet, if you wish you can use regular huge pages on VM
level.
Best Regards,
Strahil Nikolov
В вторник, 28 септември 2021 г., 09:21:09 ч. Гринуич+3, Tommy Sway <sz_cuitao(a)163.com
<mailto:sz_cuitao@163.com> > написа:
What problem will appear if I use the default transparent huge page enabled mode for
physical hosts, but configure traditional huge page memory on the virtual machine for
database SGA ?
Or is it better to disable transparent huge page on physical machines and still use
traditional huge page memory on virtual machines?
Which one is prefer ?
From: users-bounces(a)ovirt.org <mailto:users-bounces@ovirt.org>
<users-bounces(a)ovirt.org <mailto:users-bounces@ovirt.org> > On Behalf Of
Strahil Nikolov via Users
Sent: Tuesday, September 28, 2021 12:05 AM
To: tommy <sz_cuitao(a)163.com <mailto:sz_cuitao@163.com> >; 'users'
<users(a)ovirt.org <mailto:users@ovirt.org> >
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
https://docs.oracle.com/en/database/oracle/oracle-database/19/ladbi/disab...
https://access.redhat.com/solutions/1320153
<https://access.redhat.com/solutions/1320153%20> (requires RH dev subscription or
other type of subscription) -> In short add 'transparent_hugepage=never' to the
kernel params
SLES11/12/15 -> https://www.suse.com/c/sles-1112-os-tuning-optimisation-guide-part-1/
Best Regards,
Strahil Nikolov
On Mon, Sep 27, 2021 at 16:33, tommy <sz_cuitao(a)163.com
<mailto:sz_cuitao@163.com> > wrote:
thank you!
and how to get the config info of Transparent huge pages and how to
disable it？
发自我的华为手机
-------- 原始邮件 --------
发件人： Strahil Nikolov <hunter86_bg(a)yahoo.com <mailto:hunter86_bg@yahoo.com> >
日期： 2021年9月27日周一 21:13
收件人： 'users' <users(a)ovirt.org <mailto:users@ovirt.org> >, Tommy Sway
<sz_cuitao(a)163.com <mailto:sz_cuitao@163.com> >
主 题： Re: [ovirt-users] Re: About the vm memory limit
> Transparent huge pages are enabled by default, so you need to stop
> them.I would use huge pages on both host and VM, but theoretically it
> shouldn't be a problem running a VM with enabled HugePages without
> configuring on Host.Best Regards,Strahil NikolovВ събота, 25
> септември 2021 г., 15:25:10 ч. Гринуич+3, Tommy Sway
> <sz_cuitao(a)163.com <mailto:sz_cuitao@163.com> > написа: transparent huge
pages are not used on vm
> and physical host. But, can I enable hugepage memory on virtual
> machines but not on a physical machine?For database running on vm,
> and it needs to config hugepage. From: Strahil Nikolov
> <hunter86_bg(a)yahoo.com <mailto:hunter86_bg@yahoo.com> > Sent: Saturday,
September 25, 2021 5:32 PMTo:
> Tommy Sway <sz_cuitao(a)163.com <mailto:sz_cuitao@163.com> >Subject: Re:
[ovirt-users] About the vm
> memory limit It depends on the numa configuration of the host. If you
> have 256G per CPU, it's best to stay into that range. Also, consider
> disabling transparent huge pages on the host & VM. Since 4.4 Regular
> Huge Pages (do not confuse them with THP) can be used on the
> Hypervisors, while on 4.3 there were some issues but I can't provode
> any details. Best Regards,Strahil Nikolov> On Fri, Sep 24, 2021 at
> 6:40, Tommy Sway> <sz_cuitao(a)163.com <mailto:sz_cuitao@163.com> >
wrote:> I would like to ask if
> there is any limit on the memory size of virtual machines, or
> performance curve or something like that?> As long as there is memory
> on the physical machine, the more virtual machines the better?> > In
> our usage scenario, there are many virtual machines with databases,
> and their memory varies greatly. > For some virtual machines, 4G
> memory is enough, while for some virtual machines, 64GB memory is
> needed.> > I want to know what is the best use of memory for a
> virtual machine, since the virtual machine is just a QEMU emulation
> process on a physical machine, and I worry that it is not using as
> much memory as a physical machine. Understand this so that we can
> develop guidelines for optimal memory usage scenarios for virtual
> machines.> > Thank you!> > >
> _______________________________________________Users mailing list --
> users(a)ovirt.orgTo <mailto:users@ovirt.orgTo> unsubscribe send an email to
> users-leave(a)ovirt.orgPrivacy <mailto:users-leave@ovirt.orgPrivacy> Statement:
> https://www.ovirt.org/privacy-policy.htmloVirt
<https://www.ovirt.org/privacy-policy.htmloVirt%20> Code of Conduct:
> https://www.ovirt.org/community/about/community-guidelines/List
<https://www.ovirt.org/community/about/community-guidelines/List%20>
> Archives:
> https://lists.ovirt.org/archives/list/users@ovirt.org/message/Y6XDOIM
> KCP4JEJF7M5DLJ33U2ENJKGAN/___________________________________________
> ____Users mailing list -- users(a)ovirt.orgTo <mailto:users@ovirt.orgTo>
unsubscribe send an email
> to users-leave(a)ovirt.orgPrivacy <mailto:users-leave@ovirt.orgPrivacy>
Statement:
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<https://www.ovirt.org/privacy-policy.htmloVirt%20> Code of Conduct:
> https://www.ovirt.org/community/about/community-guidelines/List
<https://www.ovirt.org/community/about/community-guidelines/List%20>
> Archives:
> https://lists.ovirt.org/archives/list/users@ovirt.org/message/3YHTUBA
> G42YRNEUCWG4DF5TEP2I22DMH/
_______________________________________________
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To unsubscribe send an email to users-leave(a)ovirt.org <mailto:users-leave@ovirt.org>
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7:49 a.m.
New subject: 回复： Re: About the vm memory limit
I got a 3 TB host (physical) with Oracle without Traditional Hugepages. The DB will work
even without hugepages... but how much memory will be lost - that's another story.
Disable the transparent Huge Pages and check this documentation - should be valid for
oVirt 4.3 and OLVM 4.3 as they share the same source:
https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.3/...
Best Regards,
Strahil Nikolov
В сряда, 29 септември 2021 г., 15:20:54 ч. Гринуич+3, Tommy Sway <sz_cuitao(a)163.com>
написа:
I’am 4.3, but the memory of the VM and the SGA is large , 32GB, so the vm should set the
traditional hugepage for the database SGA.
I don't know how to set up a large page on a KVM host.
Because if I make it a traditional big page, how big should I make it? Will non-VM SGA
usage of many VMs be affected?
After all, not all memory used by QEMU needs to be HugePage, and traditional large page
memory needs to be used by specific code calls and is not transparent.
These are all questions.
From: users-bounces(a)ovirt.org <users-bounces(a)ovirt.org> On Behalf Of Strahil Nikolov
via Users
Sent: Wednesday, September 29, 2021 5:39 PM
To: Tommy Sway <sz_cuitao(a)163.com>; 'users' <users(a)ovirt.org>
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
If you are on 4.3 -> disable transparent hugepages both Hypervisor and VM.
If you are using 4.4 -> disable transparent hugepages and also cobfigure regular huge
pages.
Best Regards,
Strahil Nikolov
> On Wed, Sep 29, 2021 at 5:34, Tommy Sway
> <sz_cuitao(a)163.com> wrote:
> From the Oracle OLVM support:
>
> Configuring the Hugepages for guest VMs should be suffice, however, it needs the KVM
hosts too configured with the Hugepages.
> Since, if it not you may end with issues while staring the guest VMs.
>
> I really don't know what to do now.
>
>
>
>
>
> -----Original Message-----
> From: users-bounces(a)ovirt.org <users-bounces(a)ovirt.org> On Behalf Of Strahil
Nikolov via Users
> Sent: Tuesday, September 28, 2021 3:39 PM
> To: 'users' <users(a)ovirt.org>; Tommy Sway <sz_cuitao(a)163.com>
> Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
>
> I think that if you run VMs with Databases, you must disable transparent huge pages
on Hypervisour level and on VM level. Yet, if you wish you can use regular huge pages on
VM level.
>
> Best Regards,
> Strahil Nikolov
>
>
>
>
>
>
> В вторник, 28 септември 2021 г., 09:21:09 ч. Гринуич+3, Tommy Sway
<sz_cuitao(a)163.com> написа:
>
>
>
>
>
>
> What problem will appear if I use the default transparent huge page enabled mode for
physical hosts, but configure traditional huge page memory on the virtual machine for
database SGA ?
> Or is it better to disable transparent huge page on physical machines and still use
traditional huge page memory on virtual machines?
>
> Which one is prefer ?
>
>
> From: users-bounces(a)ovirt.org <users-bounces(a)ovirt.org> On Behalf Of Strahil
Nikolov via Users
> Sent: Tuesday, September 28, 2021 12:05 AM
> To: tommy <sz_cuitao(a)163.com>; 'users' <users(a)ovirt.org>
> Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
>
>
https://docs.oracle.com/en/database/oracle/oracle-database/19/ladbi/disab...
>
> https://access.redhat.com/solutions/1320153 (requires RH dev subscription or other
type of subscription) -> In short add 'transparent_hugepage=never' to the
kernel params
>
> SLES11/12/15 ->
https://www.suse.com/c/sles-1112-os-tuning-optimisation-guide-part-1/
>
>
> Best Regards,
> Strahil Nikolov
>
>
>
>
>
>> On Mon, Sep 27, 2021 at 16:33, tommy <sz_cuitao(a)163.com> wrote:
>> thank you!
>>
>> and how to get the config info of Transparent huge pages and how to
>> disable it？
>>
>>
>>
>>
>>
>> 发自我的华为手机
>>
>>
>> -------- 原始邮件 --------
>> 发件人： Strahil Nikolov <hunter86_bg(a)yahoo.com>
>> 日期： 2021年9月27日周一 21:13
>> 收件人： 'users' <users(a)ovirt.org>, Tommy Sway
<sz_cuitao(a)163.com>
>> 主 题： Re: [ovirt-users] Re: About the vm memory limit>> Transparent huge
pages are enabled by default, so you need to stop >> them.I would use huge pages on
both host and VM, but theoretically it >> shouldn't be a problem running a VM
with enabled HugePages without >> configuring on Host.Best Regards,Strahil NikolovВ
събота, 25 >> септември 2021 г., 15:25:10 ч. Гринуич+3, Tommy Sway >>
<sz_cuitao(a)163.com> написа: transparent huge pages are not used on vm >> and
physical host. But, can I enable hugepage memory on virtual >> machines but not on
a physical machine?For database running on vm, >> and it needs to config hugepage.
From: Strahil Nikolov >> <hunter86_bg(a)yahoo.com> Sent: Saturday, September 25,
2021 5:32 PMTo: >> Tommy Sway <sz_cuitao(a)163.com>Subject: Re: [ovirt-users]
About the vm >> memory limit It depends on the numa configuration of the host. If
you >> have 256G per CPU, it's best to stay into that range. Also, consider
>> disabling transparent huge pages on the host & VM. Since 4.4 Regular >>
Huge Pages (do not confuse them with THP) can be used on the >> Hypervisors, while
on 4.3 there were some issues but I can't provode >> any details. Best
Regards,Strahil Nikolov> On Fri, Sep 24, 2021 at >> 6:40, Tommy Sway>
<sz_cuitao(a)163.com> wrote:> I would like to ask if >> there is any limit on
the memory size of virtual machines, or >> performance curve or something like
that?> As long as there is memory >> on the physical machine, the more virtual
machines the better?> > In >> our usage scenario, there are many virtual
machines with databases, >> and their memory varies greatly. > For some virtual
machines, 4G >> memory is enough, while for some virtual machines, 64GB memory is
>> needed.> > I want to know what is the best use of memory for a >>
virtual machine, since the virtual machine is just a QEMU emulation >> process on a
physical machine, and I worry that it is not using as >> much memory as a physical
machine. Understand this so that we can >> develop guidelines for optimal memory
usage scenarios for virtual >> machines.> > Thank you!> > >
>> _______________________________________________Users mailing list -- >>
users(a)ovirt.orgTo unsubscribe send an email to >> users-leave(a)ovirt.orgPrivacy
Statement: >> https://www.ovirt.org/privacy-policy.htmloVirt Code of Conduct:
>> https://www.ovirt.org/community/about/community-guidelines/List >>
Archives: >>
https://lists.ovirt.org/archives/list/users@ovirt.org/message/Y6XDOIM>...
KCP4JEJF7M5DLJ33U2ENJKGAN/___________________________________________>> ____Users
mailing list -- users(a)ovirt.orgTo unsubscribe send an email >> to
users-leave(a)ovirt.orgPrivacy Statement: >>
https://www.ovirt.org/privacy-policy.htmloVirt Code of Conduct: >>
https://www.ovirt.org/community/about/community-guidelines/List >> Archives:
>> https://lists.ovirt.org/archives/list/users@ovirt.org/message/3YHTUBA>...
G42YRNEUCWG4DF5TEP2I22DMH/_______________________________________________Users mailing
list -- users(a)ovirt.orgTo unsubscribe send an email to users-leave(a)ovirt.org Privacy
Statement: https://www.ovirt.org/privacy-policy.htmloVirt Code of Conduct:
https://www.ovirt.org/community/about/community-guidelines/List Archives:
https://lists.ovirt.org/archives/list/users@ovirt.org/message/GRNMITHSDUE...
> _______________________________________________Users mailing list --
users(a)ovirt.orgTo unsubscribe send an email to users-leave(a)ovirt.orgPrivacy Statement:
https://www.ovirt.org/privacy-policy.htmloVirt Code of Conduct:
https://www.ovirt.org/community/about/community-guidelines/List Archives:
>
https://lists.ovirt.org/archives/list/users@ovirt.org/message/QBQHER4G2VL...
>
10:24 p.m.
New subject: 回复： Re: About the vm memory limit
In my scenario, the physical machine has a lot of memory (4TB), with dozens of virtual
machines running on it, each vm is running a database, and every vm is set up with
traditional large-page memory.
In this case, whether it is necessary to set up large page memory on the physical machine
and what type of large page memory should be set up, this issue has not been determined, I
am also very confused.
-----Original Message-----
From: users-bounces(a)ovirt.org <users-bounces(a)ovirt.org> On Behalf Of Strahil Nikolov
via Users
Sent: Wednesday, September 29, 2021 8:50 PM
To: 'users' <users(a)ovirt.org>; Tommy Sway <sz_cuitao(a)163.com>
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
I got a 3 TB host (physical) with Oracle without Traditional Hugepages. The DB will work
even without hugepages... but how much memory will be lost - that's another story.
Disable the transparent Huge Pages and check this documentation - should be valid for
oVirt 4.3 and OLVM 4.3 as they share the same source:
https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.3/...
Best Regards,
Strahil Nikolov
В сряда, 29 септември 2021 г., 15:20:54 ч. Гринуич+3, Tommy Sway <sz_cuitao(a)163.com>
написа:
I’am 4.3, but the memory of the VM and the SGA is large , 32GB, so the vm should set the
traditional hugepage for the database SGA.
I don't know how to set up a large page on a KVM host.
Because if I make it a traditional big page, how big should I make it? Will non-VM SGA
usage of many VMs be affected?
After all, not all memory used by QEMU needs to be HugePage, and traditional large page
memory needs to be used by specific code calls and is not transparent.
These are all questions.
From: users-bounces(a)ovirt.org <users-bounces(a)ovirt.org> On Behalf Of Strahil Nikolov
via Users
Sent: Wednesday, September 29, 2021 5:39 PM
To: Tommy Sway <sz_cuitao(a)163.com>; 'users' <users(a)ovirt.org>
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
If you are on 4.3 -> disable transparent hugepages both Hypervisor and VM.
If you are using 4.4 -> disable transparent hugepages and also cobfigure regular huge
pages.
Best Regards,
Strahil Nikolov
On Wed, Sep 29, 2021 at 5:34, Tommy Sway <sz_cuitao(a)163.com>
wrote:
From the Oracle OLVM support:
Configuring the Hugepages for guest VMs should be suffice, however, it needs the KVM
hosts too configured with the Hugepages.
Since, if it not you may end with issues while staring the guest VMs.
I really don't know what to do now.
-----Original Message-----
From: users-bounces(a)ovirt.org <users-bounces(a)ovirt.org> On Behalf Of
Strahil Nikolov via Users
Sent: Tuesday, September 28, 2021 3:39 PM
To: 'users' <users(a)ovirt.org>; Tommy Sway <sz_cuitao(a)163.com>
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
I think that if you run VMs with Databases, you must disable transparent huge pages on
Hypervisour level and on VM level. Yet, if you wish you can use regular huge pages on VM
level.
Best Regards,
Strahil Nikolov
В вторник, 28 септември 2021 г., 09:21:09 ч. Гринуич+3, Tommy Sway
<sz_cuitao(a)163.com> написа:
What problem will appear if I use the default transparent huge page enabled mode for
physical hosts, but configure traditional huge page memory on the virtual machine for
database SGA ?
Or is it better to disable transparent huge page on physical machines and still use
traditional huge page memory on virtual machines?
Which one is prefer ?
From: users-bounces(a)ovirt.org <users-bounces(a)ovirt.org> On Behalf Of
Strahil Nikolov via Users
Sent: Tuesday, September 28, 2021 12:05 AM
To: tommy <sz_cuitao(a)163.com>; 'users' <users(a)ovirt.org>
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
https://docs.oracle.com/en/database/oracle/oracle-database/19/ladbi/di
sabling-transparent-hugepages.html
https://access.redhat.com/solutions/1320153 (requires RH dev
subscription or other type of subscription) -> In short add
'transparent_hugepage=never' to the kernel params
SLES11/12/15 ->
https://www.suse.com/c/sles-1112-os-tuning-optimisation-guide-part-1/
Best Regards,
Strahil Nikolov
> On Mon, Sep 27, 2021 at 16:33, tommy <sz_cuitao(a)163.com> wrote:
> thank you!
>
> and how to get the config info of Transparent huge pages and how to
> disable it？
>
>
>
>
>
> 发自我的华为手机
>
>
> -------- 原始邮件 --------
> 发件人： Strahil Nikolov <hunter86_bg(a)yahoo.com>
> 日期： 2021年9月27日周一 21:13
> 收件人： 'users' <users(a)ovirt.org>, Tommy Sway <sz_cuitao(a)163.com>
> 主 题： Re: [ovirt-users] Re: About the vm memory limit>> Transparent
> huge pages are enabled by default, so you need to stop >> them.I
> would use huge pages on both host and VM, but theoretically it >>
> shouldn't be a problem running a VM with enabled HugePages without >>
> configuring on Host.Best Regards,Strahil NikolovВ събота, 25 >>
> септември 2021 г., 15:25:10 ч. Гринуич+3, Tommy Sway >>
> <sz_cuitao(a)163.com> написа: transparent huge pages are not used on vm
> >> and physical host. But, can I enable hugepage memory on virtual
> >> machines but not on a physical machine?For database running on vm,
> >> and it needs to config hugepage. From: Strahil Nikolov >>
> <hunter86_bg(a)yahoo.com> Sent: Saturday, September 25, 2021 5:32 PMTo:
> >> Tommy Sway <sz_cuitao(a)163.com>Subject: Re: [ovirt-users] About the
> vm >> memory limit It depends on the numa configuration of the host.
> If you >> have 256G per CPU, it's best to stay into that range. Also,
> consider >> disabling transparent huge pages on the host & VM. Since
> 4.4 Regular >> Huge Pages (do not confuse them with THP) can be used
> on the >> Hypervisors, while on 4.3 there were some issues but I
> can't provode >> any details. Best Regards,Strahil Nikolov> On Fri,
> Sep 24, 2021 at >> 6:40, Tommy Sway> <sz_cuitao(a)163.com> wrote:> I
> would like to ask if >> there is any limit on the memory size of
> virtual machines, or >> performance curve or something like that?> As
> long as there is memory >> on the physical machine, the more virtual
> machines the better?> > In >> our usage scenario, there are many
> virtual machines with databases, >> and their memory varies greatly.
> > For some virtual machines, 4G >> memory is enough, while for some
> virtual machines, 64GB memory is >> needed.> > I want to know what
> is the best use of memory for a >> virtual machine, since the virtual
> machine is just a QEMU emulation >> process on a physical machine,
> and I worry that it is not using as >> much memory as a physical
> machine. Understand this so that we can >> develop guidelines for
> optimal memory usage scenarios for virtual >> machines.> > Thank
> you!> > > >> _______________________________________________Users
> mailing list -- >> users(a)ovirt.orgTo unsubscribe send an email to >>
> users-leave(a)ovirt.orgPrivacy Statement: >>
> https://www.ovirt.org/privacy-policy.htmloVirt Code of Conduct: >>
> https://www.ovirt.org/community/about/community-guidelines/List >>
> Archives: >>
> https://lists.ovirt.org/archives/list/users@ovirt.org/message/Y6XDOIM
> >>
> KCP4JEJF7M5DLJ33U2ENJKGAN/___________________________________________
> >> ____Users mailing list -- users(a)ovirt.orgTo unsubscribe send an
> email >> to users-leave(a)ovirt.orgPrivacy Statement: >>
> https://www.ovirt.org/privacy-policy.htmloVirt Code of Conduct: >>
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> Archives: >>
> https://lists.ovirt.org/archives/list/users@ovirt.org/message/3YHTUBA
> >>
> G42YRNEUCWG4DF5TEP2I22DMH/___________________________________________
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> to users-leave(a)ovirt.org Privacy Statement:
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> Archives:
> https://lists.ovirt.org/archives/list/users@ovirt.org/message/GRNMITH
> SDUEUB2JL2HM522ZGBTF4OPIC/
_______________________________________________Users mailing list -- users(a)ovirt.orgTo
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10:34 a.m.
New subject: 回复： Re: About the vm memory limit
Each VM for that 4TB host will be a single process. When that process addresses some
memory location, the kernel will lookup in the translation lookaside buffer (TLB) and in
case the Host is using Hugepages the kernel needs less time to find the memory page (page
table walk), which slows the process (in your case the VM).
Simplified said -> the VM process should be seen as an Oracle DB. On bare metal you
want to disable transparent hugepages and enable the 2M hugepages for ODB - so logically
VMs doing the same workload should be treated the same way.
Here is a link to Oracle's OLVM (based on oVirt):
https://docs.oracle.com/en/virtualization/oracle-linux-virtualization-man...
Best Regards,Strahil Nikolov
On Thu, Sep 30, 2021 at 6:25, Tommy Sway<sz_cuitao(a)163.com> wrote: In my
scenario, the physical machine has a lot of memory (4TB), with dozens of virtual machines
running on it, each vm is running a database, and every vm is set up with traditional
large-page memory.
In this case, whether it is necessary to set up large page memory on the physical machine
and what type of large page memory should be set up, this issue has not been determined, I
am also very confused.
-----Original Message-----
From: users-bounces(a)ovirt.org <users-bounces(a)ovirt.org> On Behalf Of Strahil Nikolov
via Users
Sent: Wednesday, September 29, 2021 8:50 PM
To: 'users' <users(a)ovirt.org>; Tommy Sway <sz_cuitao(a)163.com>
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
I got a 3 TB host (physical) with Oracle without Traditional Hugepages. The DB will work
even without hugepages... but how much memory will be lost - that's another story.
Disable the transparent Huge Pages and check this documentation - should be valid for
oVirt 4.3 and OLVM 4.3 as they share the same source:
https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.3/...
Best Regards,
Strahil Nikolov
В сряда, 29 септември 2021 г., 15:20:54 ч. Гринуич+3, Tommy Sway <sz_cuitao(a)163.com>
написа:
I’am 4.3, but the memory of the VM and the SGA is large , 32GB, so the vm should set the
traditional hugepage for the database SGA.
I don't know how to set up a large page on a KVM host.
Because if I make it a traditional big page, how big should I make it? Will non-VM SGA
usage of many VMs be affected?
After all, not all memory used by QEMU needs to be HugePage, and traditional large page
memory needs to be used by specific code calls and is not transparent.
These are all questions.
From: users-bounces(a)ovirt.org <users-bounces(a)ovirt.org> On Behalf Of Strahil Nikolov
via Users
Sent: Wednesday, September 29, 2021 5:39 PM
To: Tommy Sway <sz_cuitao(a)163.com>; 'users' <users(a)ovirt.org>
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
If you are on 4.3 -> disable transparent hugepages both Hypervisor and VM.
If you are using 4.4 -> disable transparent hugepages and also cobfigure regular huge
pages.
Best Regards,
Strahil Nikolov
On Wed, Sep 29, 2021 at 5:34, Tommy Sway <sz_cuitao(a)163.com>
wrote:
From the Oracle OLVM support:
Configuring the Hugepages for guest VMs should be suffice, however, it needs the KVM
hosts too configured with the Hugepages.
Since, if it not you may end with issues while staring the guest VMs.
I really don't know what to do now.
-----Original Message-----
From: users-bounces(a)ovirt.org <users-bounces(a)ovirt.org> On Behalf Of
Strahil Nikolov via Users
Sent: Tuesday, September 28, 2021 3:39 PM
To: 'users' <users(a)ovirt.org>; Tommy Sway <sz_cuitao(a)163.com>
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
I think that if you run VMs with Databases, you must disable transparent huge pages on
Hypervisour level and on VM level. Yet, if you wish you can use regular huge pages on VM
level.
Best Regards,
Strahil Nikolov
В вторник, 28 септември 2021 г., 09:21:09 ч. Гринуич+3, Tommy Sway
<sz_cuitao(a)163.com> написа:
What problem will appear if I use the default transparent huge page enabled mode for
physical hosts, but configure traditional huge page memory on the virtual machine for
database SGA ?
Or is it better to disable transparent huge page on physical machines and still use
traditional huge page memory on virtual machines?
Which one is prefer ?
From: users-bounces(a)ovirt.org <users-bounces(a)ovirt.org> On Behalf Of
Strahil Nikolov via Users
Sent: Tuesday, September 28, 2021 12:05 AM
To: tommy <sz_cuitao(a)163.com>; 'users' <users(a)ovirt.org>
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
https://docs.oracle.com/en/database/oracle/oracle-database/19/ladbi/di
sabling-transparent-hugepages.html
https://access.redhat.com/solutions/1320153 (requires RH dev
subscription or other type of subscription) -> In short add
'transparent_hugepage=never' to the kernel params
SLES11/12/15 ->
https://www.suse.com/c/sles-1112-os-tuning-optimisation-guide-part-1/
Best Regards,
Strahil Nikolov
> On Mon, Sep 27, 2021 at 16:33, tommy <sz_cuitao(a)163.com> wrote:
> thank you!
>
> and how to get the config info of Transparent huge pages and how to
> disable it？
>
>
>
>
>
> 发自我的华为手机
>
>
> -------- 原始邮件 --------
> 发件人： Strahil Nikolov <hunter86_bg(a)yahoo.com>
> 日期： 2021年9月27日周一 21:13
> 收件人： 'users' <users(a)ovirt.org>, Tommy Sway <sz_cuitao(a)163.com>
> 主 题： Re: [ovirt-users] Re: About the vm memory limit>> Transparent
> huge pages are enabled by default, so you need to stop >> them.I
> would use huge pages on both host and VM, but theoretically it >>
> shouldn't be a problem running a VM with enabled HugePages without >>
> configuring on Host.Best Regards,Strahil NikolovВ събота, 25 >>
> септември 2021 г., 15:25:10 ч. Гринуич+3, Tommy Sway >>
> <sz_cuitao(a)163.com> написа: transparent huge pages are not used on vm
> >> and physical host. But, can I enable hugepage memory on virtual
> >> machines but not on a physical machine?For database running on vm,
> >> and it needs to config hugepage. From: Strahil Nikolov >>
> <hunter86_bg(a)yahoo.com> Sent: Saturday, September 25, 2021 5:32 PMTo:
> >> Tommy Sway <sz_cuitao(a)163.com>Subject: Re: [ovirt-users] About the
> vm >> memory limit It depends on the numa configuration of the host.
> If you >> have 256G per CPU, it's best to stay into that range. Also,
> consider >> disabling transparent huge pages on the host & VM. Since
> 4.4 Regular >> Huge Pages (do not confuse them with THP) can be used
> on the >> Hypervisors, while on 4.3 there were some issues but I
> can't provode >> any details. Best Regards,Strahil Nikolov> On Fri,
> Sep 24, 2021 at >> 6:40, Tommy Sway> <sz_cuitao(a)163.com> wrote:> I
> would like to ask if >> there is any limit on the memory size of
> virtual machines, or >> performance curve or something like that?> As
> long as there is memory >> on the physical machine, the more virtual
> machines the better?> > In >> our usage scenario, there are many
> virtual machines with databases, >> and their memory varies greatly.
> > For some virtual machines, 4G >> memory is enough, while for some
> virtual machines, 64GB memory is >> needed.> > I want to know what
> is the best use of memory for a >> virtual machine, since the virtual
> machine is just a QEMU emulation >> process on a physical machine,
> and I worry that it is not using as >> much memory as a physical
> machine. Understand this so that we can >> develop guidelines for
> optimal memory usage scenarios for virtual >> machines.> > Thank
> you!> > > >> _______________________________________________Users
> mailing list -- >> users(a)ovirt.orgTo unsubscribe send an email to >>
> users-leave(a)ovirt.orgPrivacy Statement: >>
> https://www.ovirt.org/privacy-policy.htmloVirt Code of Conduct: >>
> https://www.ovirt.org/community/about/community-guidelines/List >>
> Archives: >>
> https://lists.ovirt.org/archives/list/users@ovirt.org/message/Y6XDOIM
> >>
> KCP4JEJF7M5DLJ33U2ENJKGAN/___________________________________________
> >> ____Users mailing list -- users(a)ovirt.orgTo unsubscribe send an
> email >> to users-leave(a)ovirt.orgPrivacy Statement: >>
> https://www.ovirt.org/privacy-policy.htmloVirt Code of Conduct: >>
> https://www.ovirt.org/community/about/community-guidelines/List >>
> Archives: >>
> https://lists.ovirt.org/archives/list/users@ovirt.org/message/3YHTUBA
> >>
> G42YRNEUCWG4DF5TEP2I22DMH/___________________________________________
> ____Users mailing list -- users(a)ovirt.orgTo unsubscribe send an email
> to users-leave(a)ovirt.org Privacy Statement:
> https://www.ovirt.org/privacy-policy.htmloVirt Code of Conduct:
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> Archives:
> https://lists.ovirt.org/archives/list/users@ovirt.org/message/GRNMITH
> SDUEUB2JL2HM522ZGBTF4OPIC/
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2VLM6IVZ45XUZNV6AUEE4AR5/
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11:04 p.m.
New subject: 回复： Re: About the vm memory limit
which slows the process (in your case the VM).
Is it a clerical error? Should it be speed up the process？
On 09/30/2021 23:34, Strahil Nikolov via Users wrote:
Each VM for that 4TB host will be a single process. When that process addresses some
memory location, the kernel will lookup in the translation lookaside buffer (TLB) and in
case the Host is using Hugepages the kernel needs less time to find the memory page (page
table walk), which slows the process (in your case the VM).
Simplified said -> the VM process should be seen as an Oracle DB. On bare metal you
want to disable transparent hugepages and enable the 2M hugepages for ODB - so logically
VMs doing the same workload should be treated the same way.
Here is a link to Oracle's OLVM (based on oVirt):
https://docs.oracle.com/en/virtualization/oracle-linux-virtualization-man...
Best Regards,
Strahil Nikolov
On Thu, Sep 30, 2021 at 6:25, Tommy Sway
<sz_cuitao(a)163.com> wrote:
In my scenario, the physical machine has a lot of memory (4TB), with dozens of virtual
machines running on it, each vm is running a database, and every vm is set up with
traditional large-page memory.
In this case, whether it is necessary to set up large page memory on the physical machine
and what type of large page memory should be set up, this issue has not been determined, I
am also very confused.
-----Original Message-----
From: users-bounces(a)ovirt.org <users-bounces(a)ovirt.org> On Behalf Of Strahil Nikolov
via Users
Sent: Wednesday, September 29, 2021 8:50 PM
To: 'users' <users(a)ovirt.org>; Tommy Sway <sz_cuitao(a)163.com>
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
I got a 3 TB host (physical) with Oracle without Traditional Hugepages. The DB will work
even without hugepages... but how much memory will be lost - that's another story.
Disable the transparent Huge Pages and check this documentation - should be valid for
oVirt 4.3 and OLVM 4.3 as they share the same source:
https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.3/...
Best Regards,
Strahil Nikolov
В сряда, 29 септември 2021 г., 15:20:54 ч. Гринуич+3, Tommy Sway <sz_cuitao(a)163.com>
написа:
I’am 4.3, but the memory of the VM and the SGA is large , 32GB, so the vm should set the
traditional hugepage for the database SGA.
I don't know how to set up a large page on a KVM host.
Because if I make it a traditional big page, how big should I make it? Will non-VM SGA
usage of many VMs be affected?
After all, not all memory used by QEMU needs to be HugePage, and traditional large page
memory needs to be used by specific code calls and is not transparent.
These are all questions.
From: users-bounces(a)ovirt.org <users-bounces(a)ovirt.org> On Behalf Of Strahil Nikolov
via Users
Sent: Wednesday, September 29, 2021 5:39 PM
To: Tommy Sway <sz_cuitao(a)163.com>; 'users' <users(a)ovirt.org>
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
If you are on 4.3 -> disable transparent hugepages both Hypervisor and VM.
If you are using 4.4 -> disable transparent hugepages and also cobfigure regular huge
pages.
Best Regards,
Strahil Nikolov
On Wed, Sep 29, 2021 at 5:34, Tommy Sway <sz_cuitao(a)163.com>
wrote:
From the Oracle OLVM support:
Configuring the Hugepages for guest VMs should be suffice, however, it needs the KVM
hosts too configured with the Hugepages.
Since, if it not you may end with issues while staring the guest VMs.
I really don't know what to do now.
-----Original Message-----
From: users-bounces(a)ovirt.org <users-bounces(a)ovirt.org> On Behalf Of
Strahil Nikolov via Users
Sent: Tuesday, September 28, 2021 3:39 PM
To: 'users' <users(a)ovirt.org>; Tommy Sway <sz_cuitao(a)163.com>
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
I think that if you run VMs with Databases, you must disable transparent huge pages on
Hypervisour level and on VM level. Yet, if you wish you can use regular huge pages on VM
level.
Best Regards,
Strahil Nikolov
В вторник, 28 септември 2021 г., 09:21:09 ч. Гринуич+3, Tommy Sway
<sz_cuitao(a)163.com> написа:
What problem will appear if I use the default transparent huge page enabled mode for
physical hosts, but configure traditional huge page memory on the virtual machine for
database SGA ?
Or is it better to disable transparent huge page on physical machines and still use
traditional huge page memory on virtual machines?
Which one is prefer ?
From: users-bounces(a)ovirt.org <users-bounces(a)ovirt.org> On Behalf Of
Strahil Nikolov via Users
Sent: Tuesday, September 28, 2021 12:05 AM
To: tommy <sz_cuitao(a)163.com>; 'users' <users(a)ovirt.org>
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
https://docs.oracle.com/en/database/oracle/oracle-database/19/ladbi/di
sabling-transparent-hugepages.html
https://access.redhat.com/solutions/1320153 (requires RH dev
subscription or other type of subscription) -> In short add
'transparent_hugepage=never' to the kernel params
SLES11/12/15 ->
https://www.suse.com/c/sles-1112-os-tuning-optimisation-guide-part-1/
Best Regards,
Strahil Nikolov
> On Mon, Sep 27, 2021 at 16:33, tommy <sz_cuitao(a)163.com> wrote:
> thank you!
>
> and how to get the config info of Transparent huge pages and how to
> disable it？
>
>
>
>
>
> 发自我的华为手机
>
>
> -------- 原始邮件 --------
> 发件人： Strahil Nikolov <hunter86_bg(a)yahoo.com>
> 日期： 2021年9月27日周一 21:13
> 收件人： 'users' <users(a)ovirt.org>, Tommy Sway <sz_cuitao(a)163.com>
> 主 题： Re: [ovirt-users] Re: About the vm memory limit>> Transparent
> huge pages are enabled by default, so you need to stop >> them.I
> would use huge pages on both host and VM, but theoretically it >>
> shouldn't be a problem running a VM with enabled HugePages without >>
> configuring on Host.Best Regards,Strahil NikolovВ събота, 25 >>
> септември 2021 г., 15:25:10 ч. Гринуич+3, Tommy Sway >>
> <sz_cuitao(a)163.com> написа: transparent huge pages are not used on vm
> >> and physical host. But, can I enable hugepage memory on virtual
> >> machines but not on a physical machine?For database running on vm,
> >> and it needs to config hugepage. From: Strahil Nikolov >>
> <hunter86_bg(a)yahoo.com> Sent: Saturday, September 25, 2021 5:32 PMTo:
> >> Tommy Sway <sz_cuitao(a)163.com>Subject: Re: [ovirt-users] About the
> vm >> memory limit It depends on the numa configuration of the host.
> If you >> have 256G per CPU, it's best to stay into that range. Also,
> consider >> disabling transparent huge pages on the host & VM. Since
> 4.4 Regular >> Huge Pages (do not confuse them with THP) can be used
> on the >> Hypervisors, while on 4.3 there were some issues but I
> can't provode >> any details. Best Regards,Strahil Nikolov> On Fri,
> Sep 24, 2021 at >> 6:40, Tommy Sway> <sz_cuitao(a)163.com> wrote:> I
> would like to ask if >> there is any limit on the memory size of
> virtual machines, or >> performance curve or something like that?> As
> long as there is memory >> on the physical machine, the more virtual
> machines the better?> > In >> our usage scenario, there are many
> virtual machines with databases, >> and their memory varies greatly.
> > For some virtual machines, 4G >> memory is enough, while for some
> virtual machines, 64GB memory is >> needed.> > I want to know what
> is the best use of memory for a >> virtual machine, since the virtual
> machine is just a QEMU emulation >> process on a physical machine,
> and I worry that it is not using as >> much memory as a physical
> machine. Understand this so that we can >> develop guidelines for
> optimal memory usage scenarios for virtual >> machines.> > Thank
> you!> > > >> _______________________________________________Users
> mailing list -- >> users(a)ovirt.orgTo unsubscribe send an email to >>
> users-leave(a)ovirt.orgPrivacy Statement: >>
> https://www.ovirt.org/privacy-policy.htmloVirt Code of Conduct: >>
> https://www.ovirt.org/community/about/community-guidelines/List >>
> Archives: >>
> https://lists.ovirt.org/archives/list/users@ovirt.org/message/Y6XDOIM
> >>
> KCP4JEJF7M5DLJ33U2ENJKGAN/___________________________________________
> >> ____Users mailing list -- users(a)ovirt.orgTo unsubscribe send an
> email >> to users-leave(a)ovirt.orgPrivacy Statement: >>
> https://www.ovirt.org/privacy-policy.htmloVirt Code of Conduct: >>
> https://www.ovirt.org/community/about/community-guidelines/List >>
> Archives: >>
> https://lists.ovirt.org/archives/list/users@ovirt.org/message/3YHTUBA
> >>
> G42YRNEUCWG4DF5TEP2I22DMH/___________________________________________
> ____Users mailing list -- users(a)ovirt.orgTo unsubscribe send an email
> to users-leave(a)ovirt.org Privacy Statement:
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> Archives:
> https://lists.ovirt.org/archives/list/users@ovirt.org/message/GRNMITH
> SDUEUB2JL2HM522ZGBTF4OPIC/
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9:52 a.m.
New subject: 回复： Re: About the vm memory limit
Actually yes - should speedup the process. I've edited that draft too many times :)
On Fri, Oct 1, 2021 at 7:32, tommy sway<sz_cuitao(a)163.com> wrote:
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12:33 p.m.
New subject: 回复：Re: 回复： Re: About the vm memory limit
KVM host -> Just enable it. All VMs will be in Hugepages.
VM -> just for the SGA.
Best Regards,Strahil Nikolov
On Fri, Oct 1, 2021 at 18:01, tommy<sz_cuitao(a)163.com> wrote: If both the
KVM server and the VIRTUAL machine are configured with traditional large pages, there is
also the issue of configuring size.
Since only THE SGA uses large pages, other database components cannot use them.
Should the KVM server and virtual machine use the same memory ratio for large pages? For
example, use 50% of the total memory size to avoid imbalance caused by improper
proportion.
-------- 原始邮件 --------
发件人： Strahil Nikolov <hunter86_bg(a)yahoo.com>
日期： 2021年10月1日周五 22:52
收件人： tommy sway <sz_cuitao(a)163.com>, Strahil Nikolov via Users
<users(a)ovirt.org>
主 题： Re: [ovirt-users]Re: 回复： Re: About the vm memory limit
Actually yes - should speedup the process. I've edited that draft too many times :)
On Fri, Oct 1, 2021 at 7:32, tommy sway<sz_cuitao(a)163.com> wrote:
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12:32 a.m.
New subject: 回复：Re: 回复： Re: About the vm memory limit
but config what size of the hugepage on the kvm host？
On 10/02/2021 01:33, Strahil Nikolov via Users wrote:
KVM host -> Just enable it. All VMs will be in Hugepages.
VM -> just for the SGA.
Best Regards,
Strahil Nikolov
On Fri, Oct 1, 2021 at 18:01, tommy
<sz_cuitao(a)163.com> wrote:
If both the KVM server and the VIRTUAL machine are configured with traditional large
pages, there is also the issue of configuring size.
Since only THE SGA uses large pages, other database components cannot use them.
Should the KVM server and virtual machine use the same memory ratio for large pages? For
example, use 50% of the total memory size to avoid imbalance caused by improper
proportion.
-------- 原始邮件 --------
发件人： Strahil Nikolov <hunter86_bg(a)yahoo.com>
日期： 2021年10月1日周五 22:52
收件人： tommy sway <sz_cuitao(a)163.com>, Strahil Nikolov via Users
<users(a)ovirt.org>
主 题： Re: [ovirt-users]Re: 回复： Re: About the vm memory limit
Actually yes - should speedup the process. I've edited that draft too many times :)
On Fri, Oct 1, 2021 at 7:32, tommy sway
<sz_cuitao(a)163.com> wrote:
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2:11 a.m.
New subject: 回复：Re: 回复： Re: About the vm memory limit
If it is transparent huge page, I can only enable it, but the traditional huge page is
required to specify the specific size.
Should I follow the principle that the size of huge pages on a physical machine equals the
sum of the size of huge pages on all VMS running on it?
From: users-bounces(a)ovirt.org <users-bounces(a)ovirt.org> On Behalf Of tommy sway
Sent: Saturday, October 2, 2021 1:32 PM
To: Strahil Nikolov via Users <users(a)ovirt.org>
Subject: [ovirt-users]Re: 回复：Re: 回复： Re: About the vm memory limit
but config what size of the hugepage on the kvm host？
On 10/02/2021 01:33, <mailto:users@ovirt.org> Strahil Nikolov via Users wrote:
KVM host -> Just enable it. All VMs will be in Hugepages.
VM -> just for the SGA.
Best Regards,
Strahil Nikolov
On Fri, Oct 1, 2021 at 18:01, tommy
<sz_cuitao(a)163.com <mailto:sz_cuitao@163.com> > wrote:
If both the KVM server and the VIRTUAL machine are configured with traditional large
pages, there is also the issue of configuring size.
Since only THE SGA uses large pages, other database components cannot use them.
Should the KVM server and virtual machine use the same memory ratio for large pages? For
example, use 50% of the total memory size to avoid imbalance caused by improper
proportion.
-------- 原始邮件 --------
发件人： Strahil Nikolov <hunter86_bg(a)yahoo.com <mailto:hunter86_bg@yahoo.com> >
日期： 2021年10月1日周五 22:52
收件人： tommy sway <sz_cuitao(a)163.com <mailto:sz_cuitao@163.com> >, Strahil
Nikolov via Users <users(a)ovirt.org <mailto:users@ovirt.org> >
主 题： Re: [ovirt-users]Re: 回复： Re: About the vm memory limit
Actually yes - should speedup the process. I've edited that draft too many times :)
On Fri, Oct 1, 2021 at 7:32, tommy sway
<sz_cuitao(a)163.com <mailto:sz_cuitao@163.com> > wrote:
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6:21 a.m.
New subject: 回复： Re: About the vm memory limit
3.1.4.2 Configuring Huge Pages
You can configure a virtual machine for high performance, so that it runs with performance
metrics as close to bare metal as possible. When you choose high performance optimization,
the virtual machine is configured with a set of automatic and recommended manual settings
for maximum efficiency. By using huge pages, you increase the page size which reduces the
page table, reduces the pressure on the Translation Lookaside Buffer cache, and improves
performance.
Huge pages are pre-allocated when a virtual machine starts to run (dynamic allocation is
disabled by default).
**** Are Virtual machines mentioned here with high performance option ? So they turn off
transparent huge pages by default and use traditional huge pages instead ??
**** Most normal virtual machines use large transparent pages by default in their
operating systems.
Note
If you configure huge pages for a virtual machine, you cannot hotplug or hot uplug
memory.
To configure huge pages:
1. In the Custom Properties tab, select hugepages from the custom properties list, which
displays Please select a key… by default.
2. Enter the huge page size in KB.
You should set the huge page size to the largest size supported by the pinned host. The
recommended size for x86_64 is 1 GB.
The huge page size has the following requirements:
* The virtual machine’s huge page size must be the same size as the pinned host’s huge
page size.
* The virtual machine’s memory size must fit into the selected size of the pinned host’s
free huge pages.
* The NUMA node size must be a multiple of the huge page’s selected size.
To enable dynamic allocation of huge pages:
1. Disable the HugePages filter in the scheduler.
2. In the [performance] section in /etc/vdsm/vdsm.conf set the following:
use_dynamic_hugepages = true
**** what kind of hugepage it is ? Tradition Hugepages or Transparent Hugepages ? And
it is archived by VDSM ??
**** I’m really get confused.
From: Strahil Nikolov <hunter86_bg(a)yahoo.com>
Sent: Thursday, September 30, 2021 11:35 PM
To: Tommy Sway <sz_cuitao(a)163.com>; 'users' <users(a)ovirt.org>
Subject: Re: [ovirt-users]Re: 回复： Re: About the vm memory limit
Each VM for that 4TB host will be a single process. When that process addresses some
memory location, the kernel will lookup in the translation lookaside buffer (TLB) and in
case the Host is using Hugepages the kernel needs less time to find the memory page (page
table walk), which slows the process (in your case the VM).
Simplified said -> the VM process should be seen as an Oracle DB. On bare metal you
want to disable transparent hugepages and enable the 2M hugepages for ODB - so logically
VMs doing the same workload should be treated the same way.
Here is a link to Oracle's OLVM (based on oVirt):
https://docs.oracle.com/en/virtualization/oracle-linux-virtualization-man...
Best Regards,
Strahil Nikolov
On Thu, Sep 30, 2021 at 6:25, Tommy Sway
<sz_cuitao(a)163.com <mailto:sz_cuitao@163.com> > wrote:
In my scenario, the physical machine has a lot of memory (4TB), with dozens of virtual
machines running on it, each vm is running a database, and every vm is set up with
traditional large-page memory.
In this case, whether it is necessary to set up large page memory on the physical machine
and what type of large page memory should be set up, this issue has not been determined, I
am also very confused.
-----Original Message-----
From: users-bounces(a)ovirt.org <mailto:users-bounces@ovirt.org>
<users-bounces(a)ovirt.org <mailto:users-bounces@ovirt.org> > On Behalf Of
Strahil Nikolov via Users
Sent: Wednesday, September 29, 2021 8:50 PM
To: 'users' <users(a)ovirt.org <mailto:users@ovirt.org> >; Tommy Sway
<sz_cuitao(a)163.com <mailto:sz_cuitao@163.com> >
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
I got a 3 TB host (physical) with Oracle without Traditional Hugepages. The DB will work
even without hugepages... but how much memory will be lost - that's another story.
Disable the transparent Huge Pages and check this documentation - should be valid for
oVirt 4.3 and OLVM 4.3 as they share the same source:
https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.3/...
Best Regards,
Strahil Nikolov
В сряда, 29 септември 2021 г., 15:20:54 ч. Гринуич+3, Tommy Sway <sz_cuitao(a)163.com
<mailto:sz_cuitao@163.com> > написа:
I’am 4.3, but the memory of the VM and the SGA is large , 32GB, so the vm should set the
traditional hugepage for the database SGA.
I don't know how to set up a large page on a KVM host.
Because if I make it a traditional big page, how big should I make it? Will non-VM SGA
usage of many VMs be affected?
After all, not all memory used by QEMU needs to be HugePage, and traditional large page
memory needs to be used by specific code calls and is not transparent.
These are all questions.
From: users-bounces(a)ovirt.org <mailto:users-bounces@ovirt.org>
<users-bounces(a)ovirt.org <mailto:users-bounces@ovirt.org> > On Behalf Of
Strahil Nikolov via Users
Sent: Wednesday, September 29, 2021 5:39 PM
To: Tommy Sway <sz_cuitao(a)163.com <mailto:sz_cuitao@163.com> >;
'users' <users(a)ovirt.org <mailto:users@ovirt.org> >
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
If you are on 4.3 -> disable transparent hugepages both Hypervisor and VM.
If you are using 4.4 -> disable transparent hugepages and also cobfigure regular huge
pages.
Best Regards,
Strahil Nikolov
On Wed, Sep 29, 2021 at 5:34, Tommy Sway <sz_cuitao(a)163.com
<mailto:sz_cuitao@163.com> > wrote:
From the Oracle OLVM support:
Configuring the Hugepages for guest VMs should be suffice, however, it needs the KVM
hosts too configured with the Hugepages.
Since, if it not you may end with issues while staring the guest VMs.
I really don't know what to do now.
-----Original Message-----
From: users-bounces(a)ovirt.org <mailto:users-bounces@ovirt.org>
<users-bounces(a)ovirt.org <mailto:users-bounces@ovirt.org> > On Behalf Of
Strahil Nikolov via Users
Sent: Tuesday, September 28, 2021 3:39 PM
To: 'users' <users(a)ovirt.org <mailto:users@ovirt.org> >; Tommy Sway
<sz_cuitao(a)163.com <mailto:sz_cuitao@163.com> >
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
I think that if you run VMs with Databases, you must disable transparent huge pages on
Hypervisour level and on VM level. Yet, if you wish you can use regular huge pages on VM
level.
Best Regards,
Strahil Nikolov
В вторник, 28 септември 2021 г., 09:21:09 ч. Гринуич+3, Tommy Sway <sz_cuitao(a)163.com
<mailto:sz_cuitao@163.com> > написа:
What problem will appear if I use the default transparent huge page enabled mode for
physical hosts, but configure traditional huge page memory on the virtual machine for
database SGA ?
Or is it better to disable transparent huge page on physical machines and still use
traditional huge page memory on virtual machines?
Which one is prefer ?
From: users-bounces(a)ovirt.org <mailto:users-bounces@ovirt.org>
<users-bounces(a)ovirt.org <mailto:users-bounces@ovirt.org> > On Behalf Of
Strahil Nikolov via Users
Sent: Tuesday, September 28, 2021 12:05 AM
To: tommy <sz_cuitao(a)163.com <mailto:sz_cuitao@163.com> >; 'users'
<users(a)ovirt.org <mailto:users@ovirt.org> >
Subject: [ovirt-users]Re: 回复： Re: About the vm memory limit
https://docs.oracle.com/en/database/oracle/oracle-database/19/ladbi/di
sabling-transparent-hugepages.html
https://access.redhat.com/solutions/1320153
<https://access.redhat.com/solutions/1320153%20> (requires RH dev
subscription or other type of subscription) -> In short add
'transparent_hugepage=never' to the kernel params
SLES11/12/15 ->
https://www.suse.com/c/sles-1112-os-tuning-optimisation-guide-part-1/
Best Regards,
Strahil Nikolov
> On Mon, Sep 27, 2021 at 16:33, tommy <sz_cuitao(a)163.com
<mailto:sz_cuitao@163.com> > wrote:
> thank you!
>
> and how to get the config info of Transparent huge pages and how to
> disable it？
>
>
>
>
>
> 发自我的华为手机
>
>
> -------- 原始邮件 --------
> 发件人： Strahil Nikolov <hunter86_bg(a)yahoo.com <mailto:hunter86_bg@yahoo.com>
>
> 日期： 2021年9月27日周一 21:13
> 收件人： 'users' <users(a)ovirt.org <mailto:users@ovirt.org> >, Tommy
Sway <sz_cuitao(a)163.com <mailto:sz_cuitao@163.com> >
> 主 题： Re: [ovirt-users] Re: About the vm memory limit>> Transparent
> huge pages are enabled by default, so you need to stop >> them.I
> would use huge pages on both host and VM, but theoretically it >>
> shouldn't be a problem running a VM with enabled HugePages without >>
> configuring on Host.Best Regards,Strahil NikolovВ събота, 25 >>
> септември 2021 г., 15:25:10 ч. Гринуич+3, Tommy Sway >>
> <sz_cuitao(a)163.com <mailto:sz_cuitao@163.com> > написа: transparent huge
pages are not used on vm
> >> and physical host. But, can I enable hugepage memory on virtual
> >> machines but not on a physical machine?For database running on vm,
> >> and it needs to config hugepage. From: Strahil Nikolov >>
> <hunter86_bg(a)yahoo.com <mailto:hunter86_bg@yahoo.com> > Sent: Saturday,
September 25, 2021 5:32 PMTo:
> >> Tommy Sway <sz_cuitao(a)163.com <mailto:sz_cuitao@163.com>
>Subject: Re: [ovirt-users] About the
> vm >> memory limit It depends on the numa configuration of the host.
> If you >> have 256G per CPU, it's best to stay into that range. Also,
> consider >> disabling transparent huge pages on the host & VM. Since
> 4.4 Regular >> Huge Pages (do not confuse them with THP) can be used
> on the >> Hypervisors, while on 4.3 there were some issues but I
> can't provode >> any details. Best Regards,Strahil Nikolov> On Fri,
> Sep 24, 2021 at >> 6:40, Tommy Sway> <sz_cuitao(a)163.com
<mailto:sz_cuitao@163.com> > wrote:> I
> would like to ask if >> there is any limit on the memory size of
> virtual machines, or >> performance curve or something like that?> As
> long as there is memory >> on the physical machine, the more virtual
> machines the better?> > In >> our usage scenario, there are many
> virtual machines with databases, >> and their memory varies greatly.
> > For some virtual machines, 4G >> memory is enough, while for some
> virtual machines, 64GB memory is >> needed.> > I want to know what
> is the best use of memory for a >> virtual machine, since the virtual
> machine is just a QEMU emulation >> process on a physical machine,
> and I worry that it is not using as >> much memory as a physical
> machine. Understand this so that we can >> develop guidelines for
> optimal memory usage scenarios for virtual >> machines.> > Thank
> you!> > > >> _______________________________________________Users
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3:03 p.m.
New subject: 回复：Re: 回复： Re: About the vm memory limit
vdsm supports dynamic allocation of Huge Pages, but
https://access.redhat.com/solutions/4904441 indicates the issues in 4.3 related to
hugepages (you can see the solution via RH dev subscription).If you needed to set them
manually and everything works normally, I would have picked something like 90-95% in
HugePages.
Yet, due to the issues described in that solution - it's better to enable HugePages
only in the Guest.
Best Regards,Strahil Nikolov
On Sat, Oct 2, 2021 at 10:13, Tommy Sway<sz_cuitao(a)163.com> wrote:
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3:21 p.m.
New subject: 回复： Re: About the vm memory limit
HugePages filter -> expects preallocated Huge Pages (not THP)
So either use dynamic allocation with disabled filter or on the contrary -> fixed
ammount of pages
Best Regards,Strahil Nikolov
On Sat, Oct 2, 2021 at 14:25, Tommy Sway<sz_cuitao(a)163.com> wrote:
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10:28 p.m.
New subject: 回复：Re: 回复： Re: About the vm memory limit
Do you mean the best way is to enable traditional hugepage memory only on virtual machines
and turn off the default transparent hugepage memory on physical machines and without
enabling traditional hugepage memory?
On 10/03/2021 04:03, Strahil Nikolov via Users wrote:
vdsm supports dynamic allocation of Huge Pages, but
https://access.redhat.com/solutions/4904441 indicates the issues in 4.3 related to
hugepages (you can see the solution via RH dev subscription).
If you needed to set them manually and everything works normally, I would have picked
something like 90-95% in HugePages.
Yet, due to the issues described in that solution - it's better to enable HugePages
only in the Guest.
Best Regards,
Strahil Nikolov
On Sat, Oct 2, 2021 at 10:13, Tommy Sway
<sz_cuitao(a)163.com> wrote:
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4:05 a.m.
New subject: 回复：Re: 回复： Re: About the vm memory limit
For 4.3 - yes. This is due to the issues in 4.3Once you move to 4.4 , you should be able
to enable HugePages (not THP) on the Hypervisors without troubles.
I assume that your workload is 'in production' and stability (no downtime) is more
important that some performance gain from HugePages on the Hypervisors.
@Simon,
any hints when OLVM 4.4 will be released ?
Best Regards,Strahil Nikolov
On Sun, Oct 3, 2021 at 6:29, tommy sway<sz_cuitao(a)163.com> wrote:
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4:47 a.m.
New subject: 回复：Re: 回复： Re: About the vm memory limit
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I cannot get the result.
From: users-bounces(a)ovirt.org <users-bounces(a)ovirt.org> On Behalf Of Strahil Nikolov
via Users
Sent: Sunday, October 3, 2021 4:03 AM
To: sz_cuitao(a)163.com; 'Strahil Nikolov via Users' <users(a)ovirt.org>
Subject: [ovirt-users]Re: 回复：Re: 回复： Re: About the vm memory limit
vdsm supports dynamic allocation of Huge Pages, but
https://access.redhat.com/solutions/4904441 indicates the issues in 4.3 related to
hugepages (you can see the solution via RH dev subscription).
If you needed to set them manually and everything works normally, I would have picked
something like 90-95% in HugePages.
Yet, due to the issues described in that solution - it's better to enable HugePages
only in the Guest.
Best Regards,
Strahil Nikolov
On Sat, Oct 2, 2021 at 10:13, Tommy Sway
<sz_cuitao(a)163.com <mailto:sz_cuitao@163.com> > wrote:
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6:57 a.m.
New subject: 回复：Re: 回复： Re: About the vm memory limit
if you are eligible for the developr subscription you can subscribe at :
https://developers.redhat.com/register
P.S.: It now includes up to 16 RHEL machines for production usage.
Best Regards,Strahil Nikolov
On Sun, Oct 3, 2021 at 12:57, Tommy Sway<sz_cuitao(a)163.com> wrote:
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11:19 a.m.
New subject: 回复：Re: 回复：Re: 回复： Re: About the vm memory limit
Due to 4.3 issues pick option3 for the host (Hypervisor) and for the VM - disabled THP and
defined regular (2M) hugepages .Once you migrate to 4.4 - you will enable Hugepages on the
Hypervisors without needing downtime for the DB in the VM.
Best Regards,Strahil Nikolov
On Sun, Oct 3, 2021 at 16:46, tommy<sz_cuitao(a)163.com> wrote: My virtual
machine environment is advised by Oracle to use traditional huge pages and turn off
transparent huge pages.
At the same time, I have three choices on the KVM server: first, use the transparent huge
page as the system default; second, use the traditional huge page as the VIRTUAL machine;
third, disable the transparent huge page without activating the traditional huge page.
I'd like to know if there is a recommendation order for these three plans？
Because I feel that the amount of memory managed and used by the phisical machine is much
larger than that of the virtrual machine, if large pages are not enabled on physical
machines, will it be effective to enable large pages on virtual machines?
Even it's possible to set traditional huge pages on virtual machines on this
condation, but I'm not sure it will work as expected.
发自我的华为手机
-------- 原始邮件 --------
发件人： Strahil Nikolov <hunter86_bg(a)yahoo.com>
日期： 2021年10月3日周日 17:05
收件人： sz_cuitao(a)163.com, Strahil Nikolov via Users <users(a)ovirt.org>
抄送： Simon Coter <simon.coter(a)oracle.com>
主 题： Re: [ovirt-users]Re: 回复：Re: 回复： Re: About the vm memory limit
For 4.3 - yes. This is due to the issues in 4.3Once you move to 4.4 , you should be able
to enable HugePages (not THP) on the Hypervisors without troubles.
I assume that your workload is 'in production' and stability (no downtime) is more
important that some performance gain from HugePages on the Hypervisors.
@Simon,
any hints when OLVM 4.4 will be released ?
Best Regards,Strahil Nikolov
On Sun, Oct 3, 2021 at 6:29, tommy sway<sz_cuitao(a)163.com> wrote:
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