Re: [PATCH 2/2] x86: introduce NMI_AUTO as nmi_watchdog option

From: Mikael Pettersson
Date: Thu Nov 05 2009 - 05:58:30 EST

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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