Messages in this thread | | | Date | Wed, 16 Jun 2010 08:43:43 -1000 | From | Zachary Amsden <> | Subject | Re: [PATCH 04/17] Fix deep C-state TSC desynchronization |
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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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