Messages in this thread | | | Date | Wed, 16 Jun 2010 09:20:30 -1000 | From | Zachary Amsden <> | Subject | Re: [PATCH 04/17] Fix deep C-state TSC desynchronization |
| |
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.
| |