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?
-Darrell On Apr 4, 2014, at 8:33 AM, Michal Skrivanek <[email protected]> wrote: > Hi, > this is more for the KVM folks I suppose…can you get the qemu process cmdline > please? > > Thanks, > michal > > On 3 Apr 2014, at 12:13, Markus Stockhausen wrote: > >> Hello, >> >> 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%. >> >> 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. >> >> The reason behind that is the question I have for you experts. >> >> 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 >> >> When we start the VM the client sees TSC as available clocksource: >> >> colvm53:~ # cat >> /sys/devices/system/clocksource/clocksource0/available_clocksource >> kvm-clock tsc hpet acpi_pm >> >> After the first live migration to another host that also has constant_tsc >> (see above) >> that flag is lost inside the VM. >> >> colvm53:~ # cat >> /sys/devices/system/clocksource/clocksource0/available_clocksource >> kvm-clock hpet acpi_pm >> >> Any ideas? >> >> Markus >> >> >> <InterScan_Disclaimer.txt>_______________________________________________ >> Users mailing list >> [email protected] >> http://lists.ovirt.org/mailman/listinfo/users > > _______________________________________________ > Users mailing list > [email protected] > http://lists.ovirt.org/mailman/listinfo/users
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