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To: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
From: Dag-Erling Smorgrav <des@ofug.org>
Date: Mon, 07 Apr 2003 01:30:23 +0200
In-Reply-To: <30949.1049666639@critter.freebsd.dk> ("Poul-Henning Kamp"'s
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Subject: Re: cvs commit: src/sys/conf options.i386 src/sys/i386/i386 tsc.c
 src/sys/i386/conf NOTES
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"Poul-Henning Kamp" <phk@phk.freebsd.dk> writes:
> In message <xzpof3js45j.fsf@flood.ping.uio.no>, Dag-Erling Smorgrav writes:
> >                                              On most SMP systems, the
> > PIIX timecounter is automatically selected by virtue of being
> > discovered last.
> It is specifically discovered last because it should be used if
> at all possible.

It's more precise than the TSC (mostly because the TSC calibration
code sucks), but if one is willing to sacrifice a small amount of
precision for performance, then the TSC is probably better, I think.

> There is a big difference if you get to use "ACPI-fast" (correctly
> implemented hardware) instead of "ACPI-safe" (buggy hardware).

Unfortunately, ACPI-fast is not available on my system.

DES
-- 
Dag-Erling Smorgrav - des@ofug.org