Date: Thu, 06 Feb 2003 14:02:09 -0800 From: Peter Wemm <peter@wemm.org> To: phk@freebsd.org Cc: Bruce Evans <bde@zeta.org.au>, "Greg 'groggy' Lehey" <grog@freebsd.org>, all-committers@freebsd.org, legacy-committers@freebsd.org, cvs-all@freebsd.org Subject: Re: cvs commit: src/sys/i386/include clock.h src/sys/i386/i386 tsc.c Message-ID: <20030206220209.EDA882A89E@canning.wemm.org> In-Reply-To: <52866.1044516029@critter.freebsd.dk>
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phk@freebsd.org wrote:
> In message <20030206174018.R72201-100000@gamplex.bde.org>, Bruce Evans writes
:
>
> >However, precise measurements of these clocks turn out to be essentially
> >useless except probably for phk's nonstandard hardware, since the
> >accuracy of these clocks is much worse than their precision. Drift of
> >10-100 parts per million for a 10 degree temperature change is normal.
> >So calibrations more precise than this are not useful.
>
> Actually, things have improved, and motherboard crystals are now
> generally no worse than +/-1 PPM/K.
For newer motherboards. :-)
Cheers,
-Peter
--
Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com
"All of this is for nothing if we don't go to the stars" - JMS/B5
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