* Feng Tang <feng.t...@intel.com> wrote:
> > is even worse than that. Machine can stay is s2ram for weeks (for a
> > lot more if it is desktop and you do s2ram for powersaving). Also
> > temperature of CPU varies a lot between active and s2ram states. Is
> > TSC good enough?
>
> Yes, I think it is relatively precise. Per our test, system time backed
> by the S3 non stop TSC only has 1 second drift after 4 days running
> (with mixed running and S3 states). And before using this feature, we've
> seen many time drift problems due to the RTC HW or system FW with our
> platforms.
Nice result ...
Is that with NTP running?
Without NTP, the TSC fast-calibration on bootup is not (expected to be)
nearly as precise as the 1:345600 precision you've measured.
Thanks,
Ingo
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