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Re: [Xen-devel] time went backwards

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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