Ovirt VM Performance abd CPU times
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. 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
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 -
Xavier Naveira