Date: Thu, 16 Jul 1998 08:16:45 GMT From: jak@cetlink.net (John Kelly) To: Bruce Evans <bde@zeta.org.au> Cc: current@FreeBSD.ORG Subject: Re: tickadj -t not changing tick Message-ID: <35adaeab.207380020@mail.cetlink.net> In-Reply-To: <199807160653.QAA24751@godzilla.zeta.org.au> References: <199807160653.QAA24751@godzilla.zeta.org.au>
next in thread | previous in thread | raw e-mail | index | archive | help
On Thu, 16 Jul 1998 16:53:55 +1000, Bruce Evans <bde@zeta.org.au> wrote: >>So am I correct in assuming I >>need to increase the i8254_freq value to match the true oscillator >>rate, and the kernel will adjust accordingly? > >It wouldn't hurt, but I guess you have a Pentium not running SMP or APM, >so it wouldn;t help much. Both 486's and Pentiums, so I need to understand how to tweak both i8254 and TSC. One of my 486 machines is fast by 27.68 seconds per day, so it seems I need to change its i8254_freq to 1,193,564. >Boot with -v and note the frequency calibrated relative to the RTC and >use that is input to sysctl, or use CLK_USE_I8254_CALIBRATION to set >this frequency by default. The RTC is usually more accurate than the >i8254. That's helpful too, but using the value calculated by hand from an average daily deviation as determined by ntpdate seems more precise, so I think I'll sysctl my hand-calculated value at bootup somehow. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?35adaeab.207380020>