linux-kernel - Re: Linux 2.6.21-rc1

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Date:	Wed, 21 Feb 2007 20:23:12 +0100
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	mingo@...e.hu
Subject: Re: Linux 2.6.21-rc1

On Wed, 2007-02-21 at 10:23 -0800, Daniel Walker wrote:
> Right, but eventually there isn't a regular timer interrupt through the
> io-apic. I don't think in the past IRQ0 stops without the system
> crashing, so check_timer() could assume the timer (IRQ0) is _always_
> regular.
> 
> do you know what the requirement are for routing the NMI through the
> io-apic? 

Sorry. I checked. switching PIT off really breaks nmi_watchdog=1, as
this just mirrors IRQ#0 to the NMI. No IRQ#0 from PIT, no NMI

We could keep PIT running with an empty interrupt handler when
nmi_watchdog=1 is set, but this interferes nicely with broadcasting.

Does nmi_watchdog=2 work ? We might switch to that, when a local APIC is
available. 

	tglx



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