From mboxrd@z Thu Jan 1 00:00:00 1970 From: Konrad Rzeszutek Wilk Subject: Re: Time Change Issue Xen 4.1 Date: Fri, 11 Nov 2011 13:39:13 -0500 Message-ID: <20111111183913.GA9283@phenom.dumpdata.com> References: <4EBD5AA0.3090906@webanywhere.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <4EBD5AA0.3090906@webanywhere.co.uk> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Niall Fleming , lersek@redhat.com, pbonzini@redhat.com, JBeulich@suse.com Cc: xen-devel@lists.xensource.com, keir.xen@gmail.com List-Id: xen-devel@lists.xenproject.org On Fri, Nov 11, 2011 at 05:25:52PM +0000, Niall Fleming wrote: > Hi all, > > Already posted this over in xen-users and Konrad confirms it as a > bug and suggested to repost > it over here! Laszlo, Paolo, Jan, you guys haven't seen domething like this? It looks like a hypervisor issue where the wallclock time is not really dispursed in the shared_info. > > Issue is that changing the time in dom0 doesn't take effect on the > VMs until a reboot of dom0. > The testing example below illustrates what I mean.... > > Synopsis of testing: > > Booted the physical machine, date tells me it's 17:15:45. Hwclock agrees. > Booted a VM (using xl as xm seems to be labouring under the > impression that blockdev is missing - it isn't) > The login prompt displays the time as 17:17, which is the expected > behaviour. > Changed the time in dom0 - (date +%T -s 12:00:00), synced to hwclock. > Check that date and hwclock match - they do. > Destroy the VM and recreate. > The login prompt displays the time as 17:22. Unexpected! > > > Kernel: I git cloned tag v3.1 from the kernel.org linux.git, and > applied xen-settime patches > Also tested with jeremy-git-xen-next-2.6.32 (.41/.46) without patch, > they wouldn't apply. > Xen: 4.1.1/4.1.2 > Distribution: Gentoo > > It still doesn't work. > > I've tested that the issue also exists in Debian Squeeze (with > linux-image-3.0.0 from testing as 2.6.32-5 is broken > on my hardware). > -- > > *Niall Fleming BSc. (Hons)* > Systems Administrator > Webanywhere Limited > > Phone: 0800 862 0131 Ext: 203 > Web: http://www.webanywhere.co.uk > > Aire Valley Business Centre, Lawkholme Lane, Keighley, BD21 3BB > Registered in England with company number 4881346 > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel