From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?ISO-8859-1?Q?Andreas_F=E4rber?= <afaerber@suse.de>
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
Message-ID: <51DE8E48.1050501@suse.de>
References: <D3E216785288A145B7BC975F83A2ED103FEE9853@szxeml556-mbx.china.huawei.com>
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Cc: KVM <kvm@vger.kernel.org>, qemu-devel <qemu-devel@nongnu.org>,
	"cloudfantom@gmail.com" <cloudfantom@gmail.com>,
	"mpetersen@peak6.com" <mpetersen@peak6.com>,
	"Shouta.Uehara@jp.yokogawa.com" <Shouta.Uehara@jp.yokogawa.com>,
	"paolo.bonzini@gmail.com" <paolo.bonzini@gmail.com>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	"Huangweidong (C)" <weidong.huang@huawei.com>,
	Zanghongyong <zanghongyong@huawei.com>,
	Luonengjun <luonengjun@huawei.com>,
	Hanweidong <hanweidong@huawei.com>
To: "Zhanghaoyu (A)" <haoyu.zhang@huawei.com>
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Hi,

Am 11.07.2013 11:36, schrieb Zhanghaoyu (A):
> I met similar problem to these, while performing live migration or sa=
ve-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=3D58771
>=20
> After live migration or virsh restore [savefile], one process's CPU u=
tilization 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)?

Thanks,
Andreas

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