SV: CPU Clock Freq

[Johan Lindström]

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 at freebsd.org 
> [mailto:owner-freebsd-newbies at freebsd.org] För jason
> Skickat: den 25 mars 2004 07:41
> Till: Nikolas Britton
> Kopia: freebsd-newbies at 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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