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Whups, should note that I don=92t see the CPU utilization issues, just =
the clock source errors. This is on a 3.3.4 install with centos 6.4 =
guests.
On Apr 4, 2014, at 6:19 PM, Darrell Budic <darrell.budic(a)zenfire.com> =
wrote:
I see this on some guests as well, possibly relating to moving
between =
hosts with the same family of CPU but different absolute CPU speeds?
=20
-Darrell
=20
On Apr 4, 2014, at 8:33 AM, Michal Skrivanek =
<michal.skrivanek(a)redhat.com>
wrote:
=20
> Hi,
> this is more for the KVM folks I suppose=85can you get the qemu =
process
cmdline please?
>=20
> Thanks,
> michal
>=20
> On 3 Apr 2014, at 12:13, Markus Stockhausen wrote:
>=20
>> Hello,
>>=20
>> we have an up to date ovirt 3.4 installation. Inside we are running =
SLES11 SP3
>> VMs (Kernel 3.0.76-0.11). After live migration of these VMs
they all =
of a sudden
>> do not react any longer and CPU usage of the VM goes to
100%.
>>=20
>> We identified kvm-clock source to be the culprit and therefore =
switched
to another
>> clocksource. We ended with hpet but are not happy with that
as our =
inital goal
>> was to use the more simple designed TSC clocksoure.=20
>>=20
>> The reason behind that is the question I have for you experts.
>>=20
>> Our hosts all have the constant_tsc CPU flag available. Just to =
mention
these
>> are not identical hosts. We have a mix of Xeon 5500 and 5600
=
machines. E.G.
>> [root@colovn01 ~]# cat /proc/cpuinfo | grep constant_tsc | wc
-l
>> 8
>>=20
>> When we start the VM the client sees TSC as available clocksource:
>>=20
>> colvm53:~ # cat =
/sys/devices/system/clocksource/clocksource0/available_clocksource
>> kvm-clock tsc hpet acpi_pm
>>=20
>> After the first live migration to another host that also has =
constant_tsc
(see above)
>> that flag is lost inside the VM.
>>=20
>> colvm53:~ # cat =
/sys/devices/system/clocksource/clocksource0/available_clocksource
>> kvm-clock hpet acpi_pm
>>=20
>> Any ideas?
>>=20
>> Markus
>>=20
>>=20
>> =
<InterScan_Disclaimer.txt>_______________________________________________
>> Users mailing list
>> Users(a)ovirt.org
>>
http://lists.ovirt.org/mailman/listinfo/users
>=20
> _______________________________________________
> Users mailing list
> Users(a)ovirt.org
>
http://lists.ovirt.org/mailman/listinfo/users
=20
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<html><head><meta http-equiv=3D"Content-Type"
content=3D"text/html =
charset=3Dwindows-1252"></head><body style=3D"word-wrap: break-word;
=
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Whups, =
should note that I don=92t see the CPU utilization issues, just the =
clock source errors. This is on a 3.3.4 install with centos 6.4 =
guests.<div><br></div><div><div><div>On Apr 4, 2014,
at 6:19 PM, Darrell =
Budic <<a =
href=3D"mailto:darrell.budic@zenfire.com">darrell.budic@zenfire.com</a>>=
; wrote:</div><br class=3D"Apple-interchange-newline"><blockquote
=
type=3D"cite"><meta http-equiv=3D"Content-Type"
content=3D"text/html =
charset=3Dwindows-1252"><div style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">I see =
this on some guests as well, possibly relating to moving between hosts =
with the same family of CPU but different absolute CPU =
speeds?<div><br></div><div> =
-Darrell</div><div><br></div><div><div><div>On
Apr 4, 2014, at 8:33 AM, =
Michal Skrivanek <<a =
href=3D"mailto:michal.skrivanek@redhat.com">michal.skrivanek@redhat.com</a=
> wrote:</div><br
class=3D"Apple-interchange-newline"><blockquote =
type=3D"cite"><base href=3D"x-msg://1575/"><div
style=3D"word-wrap: =
break-word; -webkit-nbsp-mode: space; -webkit-line-break: =
after-white-space; ">Hi,<div>this is more for the KVM folks I =
suppose=85can you get the qemu process cmdline =
please?</div><div><br></div><div>Thanks,</div><div>michal</div><div><br><d=
iv><div>On 3 Apr 2014, at 12:13, Markus Stockhausen wrote:</div><br =
class=3D"Apple-interchange-newline"><blockquote
type=3D"cite"><span =
class=3D"Apple-style-span" style=3D"border-collapse: separate; =
font-family: Helvetica; font-style: normal; font-variant: normal; =
font-weight: normal; letter-spacing: normal; line-height: normal; =
orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: =
none; white-space: normal; widows: 2; word-spacing: 0px; border-spacing: =
0px; -webkit-text-decorations-in-effect: none; =
-webkit-text-stroke-width: 0px; font-size: inherit;"><div =
style=3D"direction: ltr; font-family: Tahoma; font-size: =
10pt;">Hello,<br><br>we have an up to date ovirt 3.4 installation. =
Inside we are running SLES11 SP3<br>VMs (Kernel 3.0.76-0.11). After live =
migration of these VMs they all of a sudden<br>do not react any longer =
and CPU usage of the VM goes to 100%.<br><br>We identified kvm-clock =
source to be the culprit and therefore switched to =
another<br>clocksource. We ended with hpet but are not happy with that =
as our inital goal<br>was to use the more simple designed TSC =
clocksoure.<span
class=3D"Apple-converted-space"> </span><br><br>The
=
reason behind that is the question I have for you experts.<br><br>Our =
hosts all have the constant_tsc CPU flag available. Just to mention =
these<br>are not identical hosts. We have a mix of Xeon 5500 and 5600 =
machines. E.G.<br>[root@colovn01 ~]# cat /proc/cpuinfo | grep =
constant_tsc | wc -l<br>8<br><br>When we start the VM the client sees =
TSC as available clocksource:<br><br>colvm53:~ # cat =
/sys/devices/system/clocksource/clocksource0/available_clocksource<br>kvm-=
clock tsc hpet acpi_pm<br><br>After the first live migration to another =
host that also has constant_tsc (see above)<br>that flag is lost inside =
the VM.<br><br>colvm53:~ # cat =
/sys/devices/system/clocksource/clocksource0/available_clocksource<br>kvm-=
clock hpet acpi_pm<br><br>Any =
ideas?<br><br>Markus<br><br><br></div><InterScan_Disclaimer.txt>____=
___________________________________________<br>Users mailing list<br><a =
href=3D"mailto:Users@ovirt.org">Users@ovirt.org</a><br><a =
href=3D"http://lists.ovirt.org/mailman/listinfo/users">http:...
org/mailman/listinfo/users</a></span></blockquote></div><br></div></div>__=
_____________________________________________<br>Users mailing =
list<br><a
href=3D"mailto:Users@ovirt.org">Users@ovirt.org</a><br><a =
href=3D"http://lists.ovirt.org/mailman/listinfo/users">http:...
org/mailman/listinfo/users</a><br></blockquote></div><br></div></div>_____=
__________________________________________<br>Users mailing list<br><a =
href=3D"mailto:Users@ovirt.org">Users@ovirt.org</a><br>http://lists.ovirt.=
org/mailman/listinfo/users<br></blockquote></div><br></div></body></html>=
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