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" <themadengin33r@gmail.com> To: "Markus Stockhausen" <stockhausen@collogia.de> Cc: "users" <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@collogia.de> 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 <themadengin33r@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.
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