Re: [PATCH] tsc-disable_B9

Alan Cox (alan@lxorguk.ukuu.org.uk)
26 Aug 2002 20:05:13 +0100

On Mon, 2002-08-26 at 19:45, Martin J. Bligh wrote:
> It's not correlating it to real time that's the problem. It's getting resceduled
> inbetween calls that hurts. Take your example.
>
> rdtsc
> mov %eax,%ebx
> <- get rescheduled here
> rdtsc
>
> Broken. May even take negative "time".

Statistically irrelevant. When you have 100,000 samples all the
pre-emption ones drop into the dud sample filter with IRQ disturbance
and so on.

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