Re: [patch] i386, numaq: enable TSCs again

From: Ingo Molnar
Date: Fri May 25 2007 - 04:32:15 EST



* William Lee Irwin III <wli@xxxxxxxxxxxxxx> wrote:

> > Andi, Andrew, do you remember why we disabled TSCs on NUMAQ? It was
> > slightly async between CPUs, right? In that case we should try the
> > patch below.
>
> I remember. It was far beyond "slightly async;" they would drift
> minutes apart during reasonable amounts of uptime, though it would
> take at least several days to drift so far (I don't recall how long it
> took).

yes, that's what i meant under 'slightly async'. Some AMD CPUs are like
that too and sched_clock() now handles that fine. So we should try my
patch.

Ingo
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