Re: [ovirt-users] ksmd high cpu usage from almost a week with just one vm running

From: "mad Engineer" gmail.com> To: "Doron Fediuck" Cc: "Markus Stockhausen" <stockhausen(a)collogia.de&gt;, "users" ovirt.org>, "Martin Sivak" <msivak(a)redhat.com&gt;, "Roy Golan" <rgolan(a)redhat.com&gt; Sent: Sunday, December 7, 2014 6:52:16 PM Subject: Re: [ovirt-users] ksmd high cpu usage from almost a week with just one vm running Thanks Doron, Can you confirm this behaviour,i changed (defvar ksm_free_percent 0.10) and restarted vdsm and now ksmd is behaving normally.But i don't understand why its behaving aggressively when free RAM percentages is 22% even though its close to 20 :) Regards On Sun, Dec 7, 2014 at 6:13 PM, Doron Fediuck wrote: > Hi, > you can see all the relevant definitions in mom's ksm policy. > The trigger to run ksm is defined here: > https://github.com/oVirt/vdsm/blob/master/vdsm/mom.d/03-ksm.policy#L23 > > You can change this setting (in each host you have) to something that > suits your load. We have the below bug opened and hopefully handle it > in one of the next versions. > https://bugzilla.redhat.com/show_bug.cgi?id=1026294 > > Doron > > ----- Original Message ----- >> From: "mad Engineer" gmail.com> >> To: "Markus Stockhausen" <stockhausen(a)collogia.de&gt; >> Cc: "users" ovirt.org> >> Sent: Saturday, December 6, 2014 6:13:20 PM >> Subject: Re: [ovirt-users] ksmd high cpu usage from almost a week with >> just one vm running >> >> Thanks for the info Markus >> >> free -g >> total used free shared buffers cached >> Mem: 47 32 14 0 0 0 >> >> % of usage is 68 . >> >> Why is ksmd not sleeping.Do you have any idea? >> regards, >> >> >> On Sat, Dec 6, 2014 at 8:45 PM, Markus Stockhausen >> <stockhausen(a)collogia.de&gt; wrote: >> > Memory usage > 80%: ksm kicks in. There it will run at full speed until >> > usage is below 80%. There is an open BZ from me. Bad behaviour is >> > controlled >> > by mom. >> > >> > Markus >> > >> > Am 06.12.2014 15:58 schrieb mad Engineer gmail.com>: >> > >> > Hello All, >> > I am using centos6.5 x64 on a server with 48 G RAM and 8 >> > Cores.Managed by Ovirt >> > There is only one running VM with RAM 34 G and with 6 VCPU (pinned to >> > proper numa nodes) >> > >> > from top >> > >> > top - 06:42:48 up 67 days, 20:05, 1 user, load average: 0.26, 0.20, >> > 0.17 >> > Tasks: 285 total, 2 running, 282 sleeping, 0 stopped, 1 zombie >> > Cpu(s): 1.0%us, 1.4%sy, 0.0%ni, 97.5%id, 0.1%wa, 0.0%hi, 0.0%si, >> > 0.0%st >> > Mem: 49356468k total, 33977684k used, 15378784k free, 142812k buffers >> > Swap: 12337144k total, 0k used, 12337144k free, 343052k cached >> > >> > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND >> > 101 root 25 5 0 0 0 R 27.4 0.0 5650:04 [ksmd] >> > 26004 vdsm 0 -20 3371m 64m 9400 S 9.8 0.1 1653:27 >> > /usr/bin/python /usr/share/vdsm/vdsm --pidfile /var/run/vdsm/vdsmd.pid >> > 20963 qemu 20 0 38.5g 33g 6792 S 3.9 71.6 5225:43 >> > /usr/libexec/qemu-kvm -name Cinder -S -M rhel6.5.0 -cpu Nehalem >> > -enable-kvm -m 34096 -realtime mlock=off -smp >> > 6,maxcpus=160,sockets=80,c >> > >> > from /sys/kernel/mm/ksm >> > pages_unshared 7602322 >> > pages_shared 207023 >> > pages_to_scan 64 >> > pages_volatile 31678 >> > >> > Any idea why ksmd is not coming to normal CPU usage ,on a different >> > server ksmd was disabled and for testing when i enabled it initially >> > CPU usage was high but later settled down to 3% ,in that host i have 4 >> > VMs running. >> > >> > Before turning off ksmd can any one help me find out why ksmd is >> > behaving like this.Initially it had 2 virtual machines,because of high >> > CPU utilization of this guest other is migrated to another host. >> > >> > Thanks >> > _______________________________________________ >> > Users mailing list >> > Users(a)ovirt.org >> > http://lists.ovirt.org/mailman/listinfo/users >> _______________________________________________ >> Users mailing list >> Users(a)ovirt.org >> http://lists.ovirt.org/mailman/listinfo/users >>