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SubjectRe: x86, vmi: TSC going backwards check in vmi clocksource
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On Thu, 2009-02-19 at 03:18 -0800, Ingo Molnar wrote:
> * Alok Kataria <akataria@vmware.com> wrote:
>
> > From: Alok N Kataria <akataria@vmware.com>
> >
> > Similar to the check for TSC going backwards in the TSC
> > clocksource, we also need this check for VMI clocksource.
>
> ok. Precisely what kind of bug/symptoms does this fix?

If the read CYCLES_REAL counter value is less than the cycle_last value,
it may result in time jumps.
I also saw some messages about process being stuck for more than
120sec, which was traced back to this.

Thanks,
Alok
>
> Ingo



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