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Date: Sat, 11 Nov 2006 14:51:33 +0100
From: Andi Kleen <ak@...e.de>
To: tglx@...utronix.de
Cc: Andrew Morton <akpm@...l.org>, Ingo Molnar <mingo@...e.hu>,
john stultz <johnstul@...ibm.com>,
LKML <linux-kernel@...r.kernel.org>, Len Brown <lenb@...nel.org>,
Arjan van de Ven <arjan@...radead.org>,
Roman Zippel <zippel@...ux-m68k.org>
Subject: Re: [patch 13/19] GTOD: Mark TSC unusable for highres timers
> > > And afaict the reason for that is that we're using jiffies to determine if
> > > the TSC has gone bad, and that test is getting false positives.
> >
> > The i386 clocksource had always trouble with that. e.g. I have a box
> > where the TSC works perfectly fine on a 64bit kernel, but since the new i386
> > clocksource code is in it always insists on disabling it shortly after boot.
shortly after boot means in user space here, not during the first idling.
> > My guess is that some of the checks in there are just broken and need
> > to be fixed.
>
> It's the unconditional mark_unstable call in ACPI C2 state. /me looks.
The system doesn't support C2 states. It's an older single socket Athlon 64
with VIA chipset. I haven't looked in detail on why it fails.
-Andi
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