SV: CPU Clock Freq
From: Johan Lindström (johan.jl_at_home.se)
Date: 03/25/04
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To: "'jason'" <jason@ec.rr.com>, "'Nikolas Britton'" <freebsd@nbritton.org> Date: Thu, 25 Mar 2004 09:27:05 +0100
Nikolas, try the snapshot function of VMWare of you don’t want to see the
cool startup messages.
-- Johan
> -----Ursprungligt meddelande-----
> Från: owner-freebsd-newbies@freebsd.org
> [mailto:owner-freebsd-newbies@freebsd.org] För jason
> Skickat: den 25 mars 2004 07:41
> Till: Nikolas Britton
> Kopia: freebsd-newbies@freebsd.org
> Ämne: Re: CPU Clock Freq
>
> 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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>
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