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Date: Fri, 5 Apr 2002 10:09:15 +0200
From: Pierre Lombard <pierre.lombard@imag.fr>
To: Bernd Schubert <bernd-schubert@web.de>
Cc: Mark Cooke <mpc@star.sr.bham.ac.uk>, linux-kernel@vger.kernel.org
Subject: Re: time jumps
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	Mark Cooke <mpc@star.sr.bham.ac.uk>, linux-kernel@vger.kernel.org
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On Wed, Apr 03, 2002 at 01:32:05PM +0200, Bernd Schubert wrote:
> after changing from 'CONFIG_X86_TSC=n' to 'CONFIG_X86_TSC=y' the problem 
> still exists, so I'm going to try some other suggestions.

> On Wednesday 27 March 2002 18:33, Mark Cooke wrote:
> > There is a hardware bug on some via 686a systems where the RTC appears
> > automagically change it's programmed value.
> >
> > A patch was originally made against 2.4.2, and some version of this
> > appears to be applied to current kernels (I don't have a vanilla
> > 2.4.17 to check against).  Look in arch/i386/kernel/time.c for mention
> > of 686a.
> >
> > It appears to only be used if the kernel's not compiled with
> > CONFIG_X86_TSC though, so if you have that defined you may not see the
> > problem at all...

The workaround below by Vojtech Pavlik has fixed this issue on my
system (I've a VIA based Abit KT7 and under heavy disk I/O between two
IDE channels the timer goes mad):

  Re: [PATCH] VIA timer fix was removed?
  From: Vojtech Pavlik (vojtech@suse.cz)
  Date: Mon Nov 12 2001 - 16:58:32 EST

  http://www.uwsg.iu.edu/hypermail/linux/kernel/0111.1/0951.html

If you see the message in your logs then congratulations: you hit (one
of) the VIA bug(s) ;)

--
Best regards,
  Pierre Lombard
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