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

Amador Pahim apahim at redhat.com
Tue Oct 21 14:22:27 UTC 2014

On 10/19/2014 04:48 PM, Frank Wall wrote:
> Hi Doron,
> On Sun, Oct 19, 2014 at 11:42:47AM -0400, Doron Fediuck wrote:
>> 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?
> I wasn't aware of mom.log, thanks! :-) After another host reboot
> and a manual "Sync MOM Policy" it seems like the setting finally came
> through:
> 2014-10-19 15:57:18,211 - mom.Controllers.KSM - INFO - Updating KSM configuration: pages_to_scan:64 run:0 sleep_millisecs:10
> Now the ksmd process is still there, but it remains idle.

Indeed ksmd process will always be there. The ultimate place to check 
whether it's working or not is /sys/kernel/mm/ksm/run file. "1" for 
running and "0" for sleeping. mom.log is reflecting its value and MoM 
process will change it as needed.

> I've tried this multiple times before upgrading to 3.5.0 GA
> today. Maybe it was broken between RC and GA.
> I'll keep an eye on this and open a BZ in case the setting will
> change again.
> Regards
> - Frank

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