[Pkg-xen-devel] Time problem in Xen domU's after kernel update

[Sami Haahtinen]

On Fri, 2009-07-31 at 13:02 +0000, Andy Smith wrote:
> On Fri, Jul 31, 2009 at 08:34:48PM +0800, Thomas Goirand wrote:
> > Paul van der Vlis wrote:
> > > Now I have a problem with the time in the domU's. The time does not
> > > change anymore. The time is different in the different domU's.
> > > I don't use an independent_wallclock, so the time should be the same on
> > > the dom0 and the domU's.
> > > 
> > > In the dom0 there is no problem.
> > > 
> > > Do other people have the same problem?
> 
> I've never had time synced reliably with dom0, on any hardware, with
> any packaged version of Xen.  So  use independent_wallclock and ntpd
> everywhere.

I've noticed that the xen clocksource at least appears to confuse the
kernel quite a bit. At least when running Debian kernels on Citrix
XenServer you need to change the clocksource of your domUs might freeze.

I'm not sure if this is directly related or not. In any case I've
resorted to using jiffies as clocksource on all domU hosts and my
problems have vanished. 

I wrote some thoughts about the issue here:
http://ressukka.net/blog/posts/20090305_XenServer_and_non_citrix_kernels/

Regards, Sami

-- 
Sami Haahtinen <ressu at ressukka.net>
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