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Date:      Thu, 27 Jan 2000 17:37:00 +0000
From:      Ben Smithurst <ben@scientia.demon.co.uk>
To:        Marc Giannoni <mgiannoni@capu.net>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: CMOS clock and NTP
Message-ID:  <20000127173700.A4663@strontium.scientia.demon.co.uk>
In-Reply-To: <00012700030900.03694@yowzer.archela.net>
References:  <00012700030900.03694@yowzer.archela.net>

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Marc Giannoni wrote:

> I have a Dell Dimension P100 with a fast CMOS clock.
> This clock will gain almost an hour a day, and NTP won't 
> sync with any servers.  (I have NTP working on another host)
> 
> #sysctl kern.clockrate
> #kern.clockrate: { hz = 100, tick = 10000, tickadj = 5, profhz = 1024, stathz
> = 128 }
> 
> How can I tweak the tick?   sysctl says kern.clockrate is readonly!?!

look at machdep.i8254_freq instead, I tweaked that on a machine of
mine which was gaining about 1 sec/hour and it's worked fine. (I use
ntpdate, but with errors like that it was always doing 'step' rather
than 'adjust' -- now it can always use 'adjust' as the error is less
than 0.5 sec.)

-- 
Ben Smithurst / ben@scientia.demon.co.uk / PGP: 0x99392F7D


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