Re: [PATCH 04/17] Fix deep C-state TSC desynchronization

[Zachary Amsden]

On 06/15/2010 10:10 PM, Jason Wang wrote:
> Zachary Amsden wrote:
>    
> > When CPUs with unstable TSCs enter deep C-state, TSC may stop
> > running.  This causes us to require resynchronization.  Since
> > we can't tell when this may potentially happen, we assume the
> > worst by forcing re-compensation for it at every point the VCPU
> > task is descheduled.
> >
> >
> >      
> Is there any method to do the compensation on host TSC when recovering
> from C-state? It should be simpler than do it on guest TSC.
>    

Actually, yes, we could re-calibrate from HPET.  Considering this patch 
is already broken, maybe that's a better idea.
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