Date: Wed, 19 Jan 2005 11:34:20 -0800
From: Tony Lindgren <tony@atomide.com>
To: Andrea Arcangeli <andrea@suse.de>
Cc: Pavel Machek <pavel@suse.cz>, George Anzinger <george@mvista.com>,
       john stultz <johnstul@us.ibm.com>,
       Zwane Mwaikambo <zwane@arm.linux.org.uk>,
       Con Kolivas <kernel@kolivas.org>,
       Martin Schwidefsky <schwidefsky@de.ibm.com>,
       linux-kernel@vger.kernel.org
Subject: Re: [PATCH] dynamic tick patch
Message-ID: <20050119193419.GH14545@atomide.com>
References: <20050119000556.GB14749@atomide.com> <20050119094342.GB25623@elf.ucw.cz> <20050119171323.GB14545@atomide.com> <20050119174858.GB12647@dualathlon.random> <20050119181947.GF14545@atomide.com> <20050119191208.GC12647@dualathlon.random> <20050119191731.GG14545@atomide.com>
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* Tony Lindgren <tony@atomide.com> [050119 11:20]:
> * Andrea Arcangeli <andrea@suse.de> [050119 11:12]:
> > On Wed, Jan 19, 2005 at 10:19:47AM -0800, Tony Lindgren wrote:
> > > If you have a chance, can you please provide me with some more info
> > > on your system, see my recent reply to Pavel in this thread for the
> > 
> > It's a normal UP athlon 1ghz, it should be quite widespread hardware.
> > I know at least another system that had the problem of system time going
> > in the future with 2.6 at the same rate of mine. Still it could be an
> > hardware issue after all if nobody else can reproduce it. At HZ=100 the
> > system time is again perfectly accurate like in 2.4, so probably at least
> > the PIT is ok.
> 
> I've tested it with a celeron a300 box, tyan s2460 dual athlon,
> tyan tiger 100 dual p3, and fujitsu p1110 crusoe laptop. Fujitsu I
> may not have tested with TSC, but others work with both ACPI PM
> timer and TSC.
> 
> Maybe try disabling or enabling ACPI PM timer? Or maybe it does not
> use TSC or ACPI PM timer, and that there's some bug in my patch that
> kills the plain PIT timer?

It could be HPET that kills it. I don't have any boxes with HPET
timer, can you try without HPET?

Tony
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