Re: Time Change Issue Xen 4.1

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

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

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