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 > [email protected] > http://lists.ovirt.org/mailman/listinfo/users > -- Daniel Helgenberger m box bewegtbild GmbH P: +49/30/2408781-22 F: +49/30/2408781-10 ACKERSTR. 19 D-10115 BERLIN www.m-box.de www.monkeymen.tv Geschäftsführer: Martin Retschitzegger / Michaela Göllner Handeslregister: Amtsgericht Charlottenburg / HRB 112767 _______________________________________________ Users mailing list [email protected] http://lists.ovirt.org/mailman/listinfo/users
