[ovirt-users] Ovirt VM Performance abd CPU times

[Daniel Helgenberger]

On 29.10.2014 10:21, Xavier Naveira wrote:
> Hi,
>
> We are migrating our ifrastructure from kvm+libvirt hypervisors to ovirt.
>
> Everything is working fine but we're noticing that all the qemu-kvm
> processes in the hypervisors take a lot of CPU.
Without further details of the workload this is hard tell. One Reason I 
can think of might be KSM [1]. Is it enabled on your cluster(s)? What is 
your mem over-commitment setting?

Note, IIRC the KSM policy is currently hard coded; it will start at 80% 
host mem usage.

[1] http://www.ovirt.org/Sla/host-mom-policy
>
> The typical example is an idle machine, running top from the machine
> itself it reports cpu use percentages below 10% and loads (with 2
> processors) of 0.0x. The process running that machine in the hypervisor
> rports cpu uses in the order of the 80-100%.
>
> Should the values look like this? Why are the idle machines eating up so
> much CPU time?
>
> Thank you.
> Xavier
>
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Daniel Helgenberger
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