non-invariant tsc and cputicker
Andriy Gapon
avg at freebsd.org
Mon Dec 6 18:56:35 UTC 2010
on 06/12/2010 20:34 Jung-uk Kim said the following:
> I understand that. However, it is not clear to me why you want to
> pessimize performance of old hardware. If you can convince me old
> hardware with slow timecounter hardware (e.g., i8254) does not hurt
> too much, maybe it's okay.
Overlooked this point - TSC can be very well used as a timecounter.
And in that case non-invariant TSC would veto P-state changes, which is the proper
thing to do, IMO.
--
Andriy Gapon
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