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Re: [Qemu-devel] vm performance degradation after kvm live migration or

From: Andreas Färber
Subject: Re: [Qemu-devel] vm performance degradation after kvm live migration or save-restore with ETP enabled
Date: Thu, 11 Jul 2013 12:51:52 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130620 Thunderbird/17.0.7


Am 11.07.2013 11:36, schrieb Zhanghaoyu (A):
> I met similar problem to these, while performing live migration or 
> save-restore test on the kvm platform (qemu:1.4.0, host:suse11sp2, 
> guest:suse11sp2), running tele-communication software suite in guest,
> https://lists.gnu.org/archive/html/qemu-devel/2013-05/msg00098.html
> http://comments.gmane.org/gmane.comp.emulators.kvm.devel/102506
> http://thread.gmane.org/gmane.comp.emulators.kvm.devel/100592
> https://bugzilla.kernel.org/show_bug.cgi?id=58771
> After live migration or virsh restore [savefile], one process's CPU 
> utilization went up by about 30%, resulted in throughput degradation of this 
> process.
> oprofile report on this process in guest,
> pre live migration:

So far we've been unable to reproduce this with a pure qemu-kvm /
qemu-system-x86_64 command line on several EPT machines, whereas for
virsh it was reported as confirmed. Can you please share the resulting
QEMU command line from libvirt logs or process list?

Are both host and guest kernel at 3.0.80 (latest SLES updates)?


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