Re: CPU Clock Freq
From: jason (jason_at_ec.rr.com)
Date: 03/25/04
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Date: Thu, 25 Mar 2004 01:40:49 -0500 To: Nikolas Britton <freebsd@nbritton.org>
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
>
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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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