I have had ksm[2] causing a high load (on recent centos7), such things have been reported before[1]. I suspect that this could be related to windows vm's. I am having not that many vm's in the current setup, and this load increased on the hosts with a few windows vm's that are already generating more load that others.
Is there a way to disable ksm for specific vm's in the libvirt config xml? [1] https://bugzilla.redhat.com/show_bug.cgi?id=541230 [2] https://www.kernel.org/doc/Documentation/vm/ksm.txt
