Subject: Re: Linux 2.6.21-rc1
From: Daniel Walker <dwalker@mvista.com>
To: tglx@linutronix.de
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, mingo@elte.hu
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Date: Wed, 21 Feb 2007 09:38:43 -0800
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On Wed, 2007-02-21 at 18:41 +0100, Thomas Gleixner wrote:
> On Wed, 2007-02-21 at 09:19 -0800, Daniel Walker wrote:
> > > At this point the PIT / HPET _is_ active and incrementing jiffies. The
> > > switch to local apic timers happens afterwards. 
> > 
> > Could be the switch over then which confuses the NMI . 
> 
> Why? The switch just stops the PIT/HPET. It does not fiddle with IO_APIC
> and friends at all.

I'm not an expert on the io-apic, but the check_timer() function seemed
to assume IRQ0 was happening regularly ..

> > ftp://source.mvista.com/pub/dwalker/tglx/
> 
> Nothing obvious. Bisect time :(

Well, I'm pretty sure it's HRT, cause in prior versions this only
happened when HRT is enabled. Then you guys went to the lapic all the
time, and now this is happening all the time ..

You can't reproduce this?

Daniel

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