Date: Tue, 11 Apr 2000 10:56:06 +0200 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: Greg Black <gjb-freebsd@gba.oz.au> Cc: FreeBSD-hackers@FreeBSD.ORG Subject: Re: Kernel adjustment for clock drift Message-ID: <28635.955443366@critter.freebsd.dk> In-Reply-To: Your message of "Tue, 11 Apr 2000 12:02:28 %2B1000." <nospam-38f287b4dd01d59@maxim.gba.oz.au>
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Hi Greg, I got your email, but didn't get down to it yet. On 3.4 you need to set the frequency of the relevant timecounter. If you grep Timecounter /var/run/dmesg.boot and look at the *last line*, it will say either TSC or i8254. You can then modify the frequency with the corresponding sysctl variable: machdep.i8254_freq: 1193182 or machdep.tsc_freq: 400911216 and set the frequency there. Make sure that you have APM firmly disabled in the BIOS. 7 seconds per day is 81 PPM and not atypical for PC hardware. Consider using a newer NTP (www.ntp.org), the burst mode is pretty good for dial-up/demand lines. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD coreteam member | 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 freebsd-hackers" in the body of the message
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