Re: Fwd: Re: [PATCH] linux-2.5.54_delay-cleanup_A0

From: Pavel Machek (
Date: Mon Jan 20 2003 - 14:54:19 EST


> > Well, loop_delay() was big (fatal!) problem -- it can actaully wait
> > for *less* time than told to. That happens if notebook boots during
> > "battery low" and than goes to AC power. Thinkpad 560X is example of
> > such behaviour. Slow (but working!) PIT seems to be only option on
> > such machine.
> I need to look more at the cpu_freq code, but I suspect it could it help
> solve or lessen the problem (if we can detect the event on those
> > older
> systems). Regardless, you make a good point, so if I get the time
> > I'll

It is possible to lessen the problem by measuring speed and
recalibrating if it changes, but due to delay between measuring and
recalibrating it is still not 100% reliable.

> look into a real PIT based delay.

Casualities in World Trade Center: ~3k dead inside the building,
cryptography in U.S.A. and free speech in Czech Republic.
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