[ovirt-users] Ovirt VM Performance abd CPU times

[Gianluca Cecchi]

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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