linux-kernel - Re: [PATCH 2/2] x86: introduce NMI_AUTO as nmi

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Message-ID: <19186.44983.543376.657628@pilspetsen.it.uu.se>
Date:	Thu, 5 Nov 2009 11:57:59 +0100
From:	Mikael Pettersson <mikpe@...uu.se>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Aristeu Rozanski <aris@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] x86: introduce NMI_AUTO as nmi_watchdog option

Ingo Molnar writes:
 > > but that would work only for LAPIC. You're suggesting killing IOAPIC 
 > > mode too?
 > 
 > Would it be a big loss, with all modern systems expected to have a 
 > working lapic based NMI source?

The IOAPIC NMI uses a HW resource that is free and reliable, the LAPIC NMI
uses a HW resource that is neither free nor reliable (for that application),
and for which better applications exist. So I prefer the IOAPIC NMI.

(I admit part of that preference is because using the IOAPIC NMI helped
stabilize a Dell PE2650 here years ago. Without the IOAPIC NMI the machine
would lock up hard within days or a few weeks at the most.)
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