Date: Thu, 25 Mar 2004 01:40:49 -0500 From: jason <jason@ec.rr.com> To: Nikolas Britton <freebsd@nbritton.org> Cc: freebsd-newbies@freebsd.org Subject: Re: CPU Clock Freq Message-ID: <40627EF1.6060805@ec.rr.com> In-Reply-To: <40609021.3070908@nbritton.org> References: <40609021.3070908@nbritton.org>
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Nikolas Britton wrote: > Can anyone explain why the clock is off by 17Mhz? This is non critical > btw I was just playing with the diff command an wasn't expecting to > see this, the system is FreeBSD 5.2.1 running as a guest OS in VMWare > (Win2k host).....my guess is its just vmware playing tricks on freebsd... > > #diff dmesg.today dmesg.yesterday > 8c8 > < CPU: Intel(R) Celeron(R) CPU 1.70GHz (1733.85-MHz 686-class CPU) > --- > > CPU: Intel(R) Celeron(R) CPU 1.70GHz (1716.78-MHz 686-class CPU) > 79c79 > < Timecounter "TSC" frequency 1733846104 Hz quality 800 > --- > > Timecounter "TSC" frequency 1716778304 Hz quality 800 > 85a86,91 > > WARNING: / was not properly dismounted > > WARNING: /tmp was not properly dismounted > > /tmp: mount pending error: blocks 4 files 3 > > WARNING: /usr was not properly dismounted > > WARNING: /var was not properly dismounted > > cd9660: RockRidge Extension > > _______________________________________________ > freebsd-newbies@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-newbies > To unsubscribe, send any mail to > "freebsd-newbies-unsubscribe@freebsd.org" > If no else will take this one, because of percent error. The clock generator make a reference clock much lower that you cpu. The cpu uses multipliers of buses that are multiplies of this reference clock. If the quartz crystal is off by 1%, then multiply by 10, 100, or 10,000 you can get 17 or more mhz off. Also the temp of the crystal plays a role in the frequency at which it vibrates. So a cold bootup vs a warm reboot will cause variance. I am going from memory so this might not be perfect info. Opps, I did not see the vmware part. Well this info should still apply. With a good motherboard monitor program you should see the cpu fluxuation a little too. By the way are you shutting down freebsd properly? Jason
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