Re: [Xen-devel] clock drift in Xen 4.0.0

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Wed, 26 May 2010, Keir Fraser wrote:
> On 26/05/2010 10:33, "James Harper" <james.harper@xxxxxxxxxxxxxxxx> wrote:
> 
> >> What domU and dom0 kernel are you running?  pvops always has
> > independent
> >> wallclock.
> > 
> > Dom0 is 2.6.31.12 (pvops), domU is 2.6.18.8 (not pvops). Which one
> > matters here?
> 
> I think pv_ops doesn't play with dependent-wallclock either way round: It
> won't resync its wallclock with Xen when running as domU; nor will it
> periodically push its wallclock down to Xen when running as dom0. So if you
> have pv_ops as the dom0 or the domU, you'd better run NTP in the domU.

A while ago I sent a patch to pvops to fix this problem (look for
"[PATCH] [PVOPS] [UPDATE] dom0 sync xen wallclock" in the
archives), but Jeremy didn't like it :)


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