Date: Thu, 06 Feb 2003 08:20:29 +0100 From: phk@freebsd.org To: Bruce Evans <bde@zeta.org.au> Cc: "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: <52866.1044516029@critter.freebsd.dk> In-Reply-To: Your message of "Thu, 06 Feb 2003 18:18:31 %2B1100." <20030206174018.R72201-100000@gamplex.bde.org>
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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. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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