From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keir Fraser Subject: Re: [Bug 1759] Xen 4.0.1 live migration/restore over-writes new hypervisor's boot-time record Date: Wed, 13 Apr 2011 21:00:42 +0100 Message-ID: References: <20110413193156.GC6445@lumida.com> Mime-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20110413193156.GC6445@lumida.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Tim M Cc: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org On 13/04/2011 20:31, "Tim M" wrote: > Next I initiated a live migration and this is what the output of the command > looks like (with commentary added): > > Wed Apr 13 12:07:48 PDT 2011 > Wed Apr 13 12:07:53 PDT 2011 > Wed Apr 13 12:07:58 PDT 2011 > Wed Apr 13 12:08:03 PDT 2011 [ migration happens here and SSH to the guest > "freezes" for about 6 min ] > Wed Apr 13 12:13:55 PDT 2011 > Wed Apr 13 12:14:00 PDT 2011 > Wed Apr 13 12:14:05 PDT 2011 Looks like the wallclock is correct after the migration however, and it's that that the patch you referred to was fixing. > I have only tried Ubuntu 10.04.2 guests running the 2.6.32 and 2.6.35 server > kernel packages but, as mentioned, this happens every time. I think this is a domU kernel bug, see a similar report here for example: http://lists.xensource.com/archives/html/xen-devel/2010-10/msg00057.html So it could be a common symptom in a range of Debian/Ubuntu kernels. -- Keir