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

[mad Engineer]

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 <dfediuck at redhat.com> 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" <themadengin33r at gmail.com>
>> To: "Markus Stockhausen" <stockhausen at collogia.de>
>> Cc: "users" <users at 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 at 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 at 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 at ovirt.org
>> > http://lists.ovirt.org/mailman/listinfo/users
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