[ovirt-users] Ovirt VM Performance abd CPU times

[Xavier Naveira]

Yeah, that's definitively worth a try. The problem is that we have been
running on ovirt for some months now and haven't realized the problem with
the RHEL 5.x vms until recently, when we began to import them (until now we
mainly run RHEL 6.x vms), so the ovirt hypervisors are production machines
and I don't have a lot of margin doing tests on them. Hopefully next week
we'll be able to decomission another of the "old ones" and then we can do
some testing before adding it to the ovirt cluster... The other thing that
we're going to test is disabling HT.

X

On Thu, Oct 30, 2014 at 12:33 PM, Gianluca Cecchi <gianluca.cecchi at gmail.com
> wrote:

> On Thu, Oct 30, 2014 at 12:25 PM, Xavier Naveira <xnaveira at gmail.com>
> wrote:
>
>> These hardware is exactly the same, no changes in bios, reinstalled from
>> scratch.
>>
>> The versions in the "old ones" are:
>>
>> RHEL 5.6
>> kvm-83-224.el5
>> libvirt-0.8.2-15.el5_6.1
>> kmod-kvm-83-224.el5
>> kvm-tools-83-224.el5
>> libvirt-0.8.2-15.el5_6.1
>> Kernel: 2.6.18-238.1.1.el5 #1 SMP Tue Jan 4 13:32:19 EST 2011 x86_64
>> x86_64 x86_64 GNU/Linux
>>
>> I the ovirt "new" ones:
>>
>> RHEL 6.5
>> qemu-img-rhev-0.12.1.2-2.415.el6_5.14.x86_64
>> qemu-kvm-rhev-0.12.1.2-2.415.el6_5.14.x86_64
>> qemu-kvm-rhev-tools-0.12.1.2-2.415.el6_5.14.x86_64
>> libvirt-0.10.2-29.el6_5.12.x86_64
>> libvirt-client-0.10.2-29.el6_5.12.x86_64
>> Kernel: 2.6.32-431.23.3.el6.x86_64 #1 SMP Wed Jul 16 06:12:23 EDT 2014
>> x86_64 x86_64 x86_64 GNU/Linux
>>
>> I haven't gone into the details but the command line generated by our old
>> software is like 2 lines of text while in the ovirt nodes for the same type
>> of machine it is 10 :)
>>
>>
>>
>
> So one "important" thing is that hypervisor OS was RHEL 5 with plain
> Qemu/KVM and instead RHEL 6 with oVirt....
> You could check if plain Qemu/KVM with RH EL 6.5 generates the same
> problems for RHEL 5.x VMs..
> Not that it would solve the problem itself, but it would help to put the
> different OS version of hypervisor as a possible cause
>
>
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