Re: [ovirt-users] Cluster settings: KSM Control not working?
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 ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
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 ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
Re: [ovirt-users] Cluster settings: KSM Control not working?
- Original Message - From: Frank Wall f...@moov.de To: Amador Pahim apa...@redhat.com Cc: users@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? ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
Re: [ovirt-users] Cluster settings: KSM Control not working?
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. 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 ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
Re: [ovirt-users] Cluster settings: KSM Control not working?
Thanks Frank. No need for manual sync if the cluster policy is set, the engine will update the police when the host moves to status up. Original message From: Frank Wall f...@moov.de Date:19/10/2014 22:48 (GMT+02:00) To: Doron Fediuck dfedi...@redhat.com Cc: Amador Pahim apa...@redhat.com,users@ovirt.org,Martin Sivak msi...@redhat.com Subject: Re: [ovirt-users] Cluster settings: KSM Control not working? 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. 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 ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
[ovirt-users] Cluster settings: KSM Control not working?
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? 2) And how do I completely and permanentely disable KSM on oVirt Nodes? Regards - Frank ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
Re: [ovirt-users] Cluster settings: KSM Control not working?
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 ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
