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

[Zachary Amsden]

On 06/16/2010 03:24 AM, Glauber Costa wrote:
> On Mon, Jun 14, 2010 at 09:34:06PM -1000, 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.
> >      
> can't we just compensate everytime check_tsc_unstable() is true?
>    

We should probably not rely on check_tsc_unstable, we should do this 
only if we don't have NONSTOP_TSC.
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