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X-Mailer: exmh version 2.5 07/13/2001 with nmh-1.0.4+dev
To: Andrew Morton <akpm@digeo.com>
Cc: john stultz <johnstul@us.ibm.com>, lkml <linux-kernel@vger.kernel.org>
Subject: Re: [RFC][PATCH] linux-2.5.59_lost-tick_A0 
In-Reply-To: Your message of "Tue, 21 Jan 2003 15:32:55 PST."
             <3E2DD8A7.3F07C40E@digeo.com> 
From: Valdis.Kletnieks@vt.edu
References: <1043189962.15683.82.camel@w-jstultz2.beaverton.ibm.com>
            <3E2DD8A7.3F07C40E@digeo.com>
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On Tue, 21 Jan 2003 15:32:55 PST, Andrew Morton said:
> john stultz wrote:
> > 
> > All,
> >         This patch addresses the following problem: Linux cannot properly
> > handle the case where interrupts are disabled for longer then two ticks.
> > 
> 
> Question is: who is holding interrupts off for so long?

Dell Latitude C840 - if you use APM, you drop clock ticks.  And that's
even *with* CONFIG_APM_ALLOW_INTS.  I think I've caught the i8k driver
doing it as well - it seems to be a generic BIOS fuckage.  Make a BIOS
call, drop some ticks.  And unless somebody has a BIOS flash that works
better than Dell's C840A07, we're stuck with it....
-- 
				Valdis Kletnieks
				Computer Systems Senior Engineer
				Virginia Tech


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