8:33 a.m.
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Hi,
this is more for the KVM folks I suppose=85can you get the qemu process =
cmdline please?
Thanks,
michal
On 3 Apr 2014, at 12:13, Markus Stockhausen wrote:
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
=
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<html><head><base href=3D"x-msg://1575/"></head><body
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; =
-webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: =
0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: =
auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div
ocsi=3D"0"=
fpstyle=3D"1"><div style=3D"direction: ltr; font-family: Tahoma;
color: =
rgb(0, 0, 0); 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><span><InterScan_Disclaimer.txt&g=
t;</span>_______________________________________________<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></div></span></blockquote></div><br></div></=
body></html>=
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