Re: [Xen-devel] time went backwards

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 12 Jun 2006, at 10:35, Jan Beulich wrote:

> I continue to see occasional 'time went backwards' messages on 
> 3.0-testing on larger systems. Is anyone else seeing
> such? Have there been any improvements to -unstable that haven't been 
> moved over? If so, can anyone point out the
> respective changesets? Thanks, Jan
That would mean cross-cpu jitter of >10ms, when TSCs are resynced every 
1s. That's a lot of jitter. I would guess that either we have a bug or 
something is changing CPU clock frequencies every once in a while 
(perhaps automatically?). Any idea if the messages correlate with lots 
of system activity or anything like that?
 -- Keir


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