Date: Tue, 20 Jul 1999 15:08:08 -0700 From: "David Schwartz" <davids@webmaster.com> To: <stable@freebsd.org> Subject: Tuning the system's clock Message-ID: <000001bed2fc$593b6990$021d85d1@youwant.to>
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FreeBSD's internal high-precision clock seems to be based on the processor's instruction cycle counter. I've found that on one machine, the clock is about 150 ppm fast. So I tried to reduce the machdep.tsc_freq value. That was bad -- instant reboot. Is there a better way of adjusting that value? Changing 'tick' doesn't seem to do much. Are the NTP pll values for mult/div documented anywhere? It seems to divide before it multiplies, which means that using them for small offsets would require high divisors, and hence a loss of accuracy. David Schwartz http://www.gpsclock.com/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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