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Date:      Tue, 30 Jan 1996 11:38:27 -0500
From:      "Garrett A. Wollman" <wollman@lcs.mit.edu>
To:        joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch)
Cc:        freebsd-current@FreeBSD.org (FreeBSD-current users)
Subject:   Re: any ideas about this crash?
Message-ID:  <9601301638.AA15588@halloran-eldar.lcs.mit.edu>
In-Reply-To: <199601300058.BAA10336@uriah.heep.sax.de>
References:  <9601291730.AA05796@halloran-eldar.lcs.mit.edu> <199601300058.BAA10336@uriah.heep.sax.de>

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<<On Tue, 30 Jan 1996 01:58:32 +0100 (MET), J Wunsch <j@uriah.heep.sax.de> said:

> My machine at work claims 99.95 MHz since i've upgraded it to -current
> today.  It displayed 100 MHz with 2.0.5.

2.0.5 automatically (:-() added a very large rounding factor to make
sure that my 60-MHz machine would actually be diagnosed as 60 MHz.
2.2 does not.

All the evidence I've seen points to problems with the ISA
timer/counter chip (well, cell in the bridge chip) and the DELAY()
function.  If you have a 90-MHz CPU and the system diagnoses it at 100
MHz, then your timer/counter is running 11% too slow, or your CPU
clock is running 11% too fast.

-GAWollman

--
Garrett A. Wollman   | Shashish is simple, it's discreet, it's brief. ... 
wollman@lcs.mit.edu  | Shashish is the bonding of hearts in spite of distance.
Opinions not those of| It is a bond more powerful than absence.  We like people
MIT, LCS, ANA, or NSA| who like Shashish.  - Claude McKenzie + Florent Vollant



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