From: Mikael Pettersson <mikpe@it.uu.se>
To: Ingo Molnar <mingo@elte.hu>
Cc: "Aristeu Rozanski" <aris@redhat.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
"Peter Zijlstra" <a.p.zijlstra@chello.nl>,
"Frédéric Weisbecker" <fweisbec@gmail.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] x86: introduce NMI_AUTO as nmi_watchdog option
Date: Thu, 5 Nov 2009 11:57:59 +0100 [thread overview]
Message-ID: <19186.44983.543376.657628@pilspetsen.it.uu.se> (raw)
In-Reply-To: <20091104155641.GA11444@elte.hu>
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.)
next prev parent reply other threads:[~2009-11-05 10:58 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-03 17:10 Aristeu Rozanski
2009-11-04 11:46 ` Ingo Molnar
2009-11-04 12:33 ` Valdis.Kletnieks
2009-11-04 17:42 ` Ingo Molnar
2009-11-04 15:19 ` Aristeu Rozanski
2009-11-04 15:56 ` Ingo Molnar
2009-11-05 10:57 ` Mikael Pettersson [this message]
2009-11-08 8:57 ` Ingo Molnar
2009-11-09 20:02 ` Aristeu Rozanski
2009-11-10 5:20 ` Ingo Molnar
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