From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: High CPU load on target host after migration Date: Thu, 06 May 2010 12:23:20 +0300 Message-ID: <4BE28A88.7020805@redhat.com> References: <201004282314.41209.thomas.beinicke@fsd-web.de> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: KVM mailing list To: Thomas Beinicke Return-path: Received: from mx1.redhat.com ([209.132.183.28]:24873 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753778Ab0EFJX0 (ORCPT ); Thu, 6 May 2010 05:23:26 -0400 In-Reply-To: <201004282314.41209.thomas.beinicke@fsd-web.de> Sender: kvm-owner@vger.kernel.org List-ID: On 04/29/2010 12:14 AM, Thomas Beinicke wrote: > Hi, > > I have been toying around with kvm / libvirt / virt-manager and it's migration > feature. > Both host machines are running a 2.6.33 Kernel. > > One host is a Dual Quad Core Intel Xeon E5520 @ 2.27GHz and the other is a > Dual Quad Core Intel E5420 @ 2.50GHz. > > Migrating Linux machines works great but Windows XP SP3 is giving me a > headache. > The migration process finishes without any crash/error but the CPU load on the > target host is ~50% on two cores. There is no CPU intensive task running > inside the VM though. > "Removing" the network card from the VM and migrating it between the two > machines doesn't seem to trigger the high CPU load. > As network driver I tried the realtek and Red Hat virtio driver but it doesn't > seem to make a difference. > > Any insights on what could cause this situation and how to best debug it? > > Can you run a profiler and see where qemu (or kvm) is spending its time? -- error compiling committee.c: too many arguments to function