[ovirt-users] Cluster settings: "KSM Control" not working?

Amador Pahim apahim at redhat.com
Thu Oct 9 20:08:56 UTC 2014

On 10/09/2014 04:31 PM, Frank Wall wrote:
> Hi,
> while testing oVirt 3.5 RC I've came across this cluster setting:
> Optimization -> KSM control -> [X] Enable KSM
> I guess it's related to Kernel Same-page Merging.
> Since KSM is a bad idea in my case (really slow CPUs), I've disabled
> this Cluster setting, expecting oVirt to disable KSM on each oVirt Node.
> But KSM is still running and consuming a lot CPU.
> 1) What is the expected result for this setting?

It will have effect next host change to Up state (i.e. from Maintenance 
or from a reboot). Anyway, you can force the policy to have effect on 
the fly: select the cluster, click in Hosts sub-tab, select the host(s) 
and click "Sync MOM Policy".

> 2) And how do I completely and permanentely disable KSM on oVirt Nodes?

This setting is permanent.

> Regards
> - Frank
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