Re: [PATCH] Re: [Xen-devel] Time went backwards

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 14 Mar 2006, at 15:32, Rik van Riel wrote:

> Actually, we come into timer_interrupt() sometimes with
> blocked + stolen > delta_cpu, so the bugfix is valid.
>
> I just no longer understand how we can get into this
> situation...
Could be due to horrendous clock jitter across CPUs. I checked in code 
yesterday to add a new debug key ('t') to Xen. If you hit that over the 
serial line, you'll get told the maximum clock difference across CPUs 
in microseconds. On my system that is usually zero or one microseconds. 
If it's much much bigger than that on your system then it needs looking 
into.
 -- Keir


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