Re: [OT] Major Clock Drift

From: Steve Underwood (
Date: Sun Feb 04 2001 - 10:18:19 EST

"Michael B. Trausch" wrote:
> On Sat, 3 Feb 2001, Josh Myer wrote:
> > Hello all,
> >
> > I know this _really_ isn't the forum for this, but a friend of mine has
> > noticed major, persistent clock drift over time. After several weeks, the
> > clock is several minutes slow (always slow). Any thoughts on the
> > cause? (Google didn't show up anything worthwhile in the first couple of
> > pages, so i gave up).
> >
> I'm having the same problem here. AMD K6-II, 450 MHz, VIA Chipset, Kernel
> 2.4.1.

If you don't use software time correction a minute a week is not too
bad, by current PC standards. Most Compaqs are off by more like a minute
a day. I have verified with a frequency counter that it is actually the
Compaq crystal oscillator which is at fault. Most motherboards are
better than this, but many are not great. The battery backed CMOS clock
is usually a lot better than the interrupt based one, but still not
great. They don't tweak them up like a watch maker would, even though
they usually use the same type of crystal.

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This archive was generated by hypermail 2b29 : Wed Feb 07 2001 - 21:00:19 EST