Re: [ovirt-users] Ovirt VM Performance abd CPU times

On 10/29/2014 11:40 AM, Daniel Helgenberger wrote: > > > 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 >> >> _______________________________________________ >> Users mailing list >> Users(a)ovirt.org >> http://lists.ovirt.org/mailman/listinfo/users >> >