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

[Doron Fediuck]

----- Original Message -----
> From: "Frank Wall" <fw at moov.de>
> To: "Amador Pahim" <apahim at redhat.com>
> Cc: users at ovirt.org
> Sent: Sunday, October 19, 2014 2:06:50 PM
> Subject: Re: [ovirt-users] Cluster settings: "KSM Control" not working?
> 
> On Thu, Oct 09, 2014 at 05:08:56PM -0300, Amador Pahim wrote:
> > 
> > On 10/09/2014 04:31 PM, Frank Wall wrote:
> > > while testing oVirt 3.5 RC I've came across this cluster setting:
> > > Optimization -> KSM control -> [X] Enable KSM
> > > [...]
> > > But KSM is still running and consuming a lot CPU.
> > 
> > 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".
> 
> Unfortunately, it doesn't work for me. Everytime I restart vdsmd
> it will automatically start ksm again (and ksmd starts consuming CPU).
> 
> I couldn't find anything ksm-related in vdsm.log. Is there a way to
> debug this? I strongly assume that the KSM Custer setting isn't working
> as expected.
> 
> FWIW, I've just upgraded to oVirt 3.5.0 GA and test this setting again.
> 
> 
> Regards
> - Frank

Hi Frank,
KSM is controlled by MoM, which gets its policy from the engine through
VDSM. MoM will call ksm directly as needed when needed. If you choose
to disable it the policy needs to get updated.
Can you please check your mom logs and see if there are any errors there?