11:07 a.m.
I have a fully patched / up-to-date engine:
Software Version:4.5.4-1.el8
And a fully patched, up-to-date host.
[root@cha3-storage dwhite]# yum info ovirt-hostLast metadata expiration check: 1:33:40 ago
on Sun 04 Jun 2023 09:28:39 AM EDT.
Installed Packages
Name : ovirt-host
Version : 4.5.0
Release : 3.el8
Architecture : x86_64
Size : 11 k
Source : ovirt-host-4.5.0-3.el8.src.rpm
Repository : @System
From repo : centos-ovirt45
The host has 32GB of RAM, and there's only 1 VM on this host.
When I try to add more CPUs to the VM from the manager UI, I get the following error:
- The requested number of vCPUs is not available on the host the VM is running on
What's going on here, and why can I not add more vCPUs to this VM?
Sent with Proton Mail secure email.
2:22 p.m.
Hello,
Hardware?
As far as I remember you cannot assign more vCPU than the number of
physical cores you have, unless you enable "Count Threads As Cores" in the
cluster configuration, and even than, the number of vCPUs is limited to the
number of SMT threads you have.
- Gilboa
On Sun, Jun 4, 2023 at 6:17 PM David White via Users <users(a)ovirt.org>
wrote:
*I have a fully patched / up-to-date engine:*
Software Version:4.5.4-1.el8
*And a fully patched, up-to-date host.*
[root@cha3-storage dwhite]# yum info ovirt-host
Last metadata expiration check: 1:33:40 ago on Sun 04 Jun 2023 09:28:39 AM
EDT.
Installed Packages
Name : ovirt-host
Version : 4.5.0
Release : 3.el8
Architecture : x86_64
Size : 11 k
Source : ovirt-host-4.5.0-3.el8.src.rpm
Repository : @System
From repo : centos-ovirt45
The host has 32GB of RAM, and there's only 1 VM on this host.
When I try to add more CPUs to the VM from the manager UI, I get the
following error:
- *The requested number of vCPUs is not available on the host the VM
is running on*
What's going on here, and why can I not add more vCPUs to this VM?
Sent with Proton Mail <https://proton.me/> secure email.
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2:52 p.m.
These are Dell R630s with 2 physical CPUs.
Intel(R) Xeon(R) CPU E5-2640 v3 @ 2.60GHz
CPU Cores per Socket:
8
Ooooh, so even though there are 32 logical cores, the physical CPUs are quad core.
Is there a downside to enabling "Count Threads As Cores" in the cluster
configuration?
Why would that not be enabled by default?
Sent with Proton Mail secure email.
------- Original Message -------
On Monday, June 5th, 2023 at 2:22 PM, Gilboa Davara <gilboad(a)gmail.com> wrote:
> - Gilboa
> On Sun, Jun 4, 2023 at 6:17 PM David White via Users <users(a)ovirt.org> wrote:
> > I have a fully patched / up-to-date engine:
> > Software Version:4.5.4-1.el8
>
>
> > And a fully patched, up-to-date host.
> > [root@cha3-storage dwhite]# yum info ovirt-hostLast metadata expiration check:
1:33:40 ago on Sun 04 Jun 2023 09:28:39 AM EDT.
> > Installed Packages
> > Name : ovirt-host
> > Version : 4.5.0
> > Release : 3.el8
> > Architecture : x86_64
> > Size : 11 k
> > Source : ovirt-host-4.5.0-3.el8.src.rpm
> > Repository : @System
> > From repo : centos-ovirt45
>
>
>
> > The host has 32GB of RAM, and there's only 1 VM on this host.
> > When I try to add more CPUs to the VM from the manager UI, I get the following
error:
>
> > - The requested number of vCPUs is not available on the host the VM is running
on
>
> > What's going on here, and why can I not add more vCPUs to this VM?
>
>
>
Hello,
Hardware?
As far as I remember you cannot assign more vCPU than the number of physical cores you
have, unless you enable "Count Threads As Cores" in the cluster configuration,
and even than, the number of vCPUs is limited to the number of SMT threads you have.
> Sent with Proton Mail secure email.
> _______________________________________________
> Users mailing list -- users(a)ovirt.org
> To unsubscribe send an email to users-leave(a)ovirt.org
> Privacy Statement: https://www.ovirt.org/privacy-policy.html
> oVirt Code of Conduct: https://www.ovirt.org/community/about/community-guidelines/
> List Archives:
https://lists.ovirt.org/archives/list/users@ovirt.org/message/5ANM4TY6DOY...
12:33 a.m.
On Mon, Jun 5, 2023, 21:52 David White <dmwhite823(a)protonmail.com> wrote:
These are Dell R630s with 2 physical CPUs.
Intel(R) Xeon(R) CPU E5-2640 v3 @ 2.60GHz
CPU Cores per Socket:
8
Ooooh, so even though there are 32 logical cores, the physical CPUs are
quad core.
Is there a downside to enabling "Count Threads As Cores" in the cluster
configuration?
Why would that not be enabled by default?
Hello,
SMT threads are not identical to physical cores, as two threads essentially
share the same core processing pipeline and cache, increasing the
utilization of the physical core resources.
In reality the performance will vary wildly between 1.0 to 1.5+ of that of
a single physical core.
In short, if you really need more than 16 active vCPUs, you may get lower
performance depending on your exact workload.
Gilboa
Sent with Proton Mail <https://proton.me/> secure email.
------- Original Message -------
On Monday, June 5th, 2023 at 2:22 PM, Gilboa Davara <gilboad(a)gmail.com>
wrote:
Hello,
Hardware?
As far as I remember you cannot assign more vCPU than the number of
physical cores you have, unless you enable "Count Threads As Cores" in
the cluster configuration, and even than, the number of vCPUs is limited to
the number of SMT threads you have.
- Gilboa
On Sun, Jun 4, 2023 at 6:17 PM David White via Users <users(a)ovirt.org>
wrote:
> *I have a fully patched / up-to-date engine:*
> Software Version:4.5.4-1.el8
>
> *And a fully patched, up-to-date host.*
> [root@cha3-storage dwhite]# yum info ovirt-host
> Last metadata expiration check: 1:33:40 ago on Sun 04 Jun 2023 09:28:39
> AM EDT.
> Installed Packages
> Name : ovirt-host
> Version : 4.5.0
> Release : 3.el8
> Architecture : x86_64
> Size : 11 k
> Source : ovirt-host-4.5.0-3.el8.src.rpm
> Repository : @System
> From repo : centos-ovirt45
>
> The host has 32GB of RAM, and there's only 1 VM on this host.
> When I try to add more CPUs to the VM from the manager UI, I get the
> following error:
>
> - *The requested number of vCPUs is not available on the host the VM
> is running on*
>
> What's going on here, and why can I not add more vCPUs to this VM?
>
> Sent with Proton Mail <https://proton.me/> secure email.
> _______________________________________________
> Users mailing list -- users(a)ovirt.org
> To unsubscribe send an email to users-leave(a)ovirt.org
> Privacy Statement: https://www.ovirt.org/privacy-policy.html
> oVirt Code of Conduct:
> https://www.ovirt.org/community/about/community-guidelines/
> List Archives:
>
https://lists.ovirt.org/archives/list/users@ovirt.org/message/5ANM4TY6DOY...
>
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days inactive
572
days old
3 comments
2 participants
participants (2)
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David White -
Gilboa Davara