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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