On Tue, Nov 29, 2005 at 03:35:39PM -0500, Lee Revell wrote:
> On Tue, 2005-11-29 at 20:53 +0100, Andi Kleen wrote:
> > We're mostly addressing it - there are problems left, but
> > overall it's looking good. The remaining problem is
> > an education issue of users to not use RDTSC directly,
> > but use gettimeofday/clock_gettime
>
> No the issue is to make gettimeofday fast enough that the people who
> currently have to use the TSC can use it. Right now it's 1500-3000 nsec
> or so, Vojtech mentioned that he has a patch that could reduce that to
It's only that slow if the hardware can't do better.
And the kernel makes it only slow when using RDTSC directly
is unsafe - so if you use it directly thinking the kernel cheats
you for your cycles you're just shoting yourself in the own foot.
> 150-300 nsec.
If you have capable hardware it can already do much better.
-Andi
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