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From: Mikael Pettersson <>
Subject: Re: [PATCH] NMI watchdog documentation
Date: Tue, 29 Jul 2003 12:37:33 +0200 (MEST)	[thread overview]
Message-ID: <> (raw)

On Mon, 28 Jul 2003 19:53:42 +0200, Andi Kleen wrote:
>On Wed, 23 Jul 2003 20:43:25 +0300
>Ville Herva <> wrote:
>> Documentation/nmi-watchdoc.txt doesn't actually tell what options need to be
>> enabled in kernel config in order to use NMI watchdog. I for one found it
>> confusing.
>> I vaguely recall someone posted a similar patch some time ago, but it still
>> doesn't seem to be present in 2.4 or 2.6-test.
>> Andi: what about x86-64 - does it have something similar that should be
>> mentioned?
>x86-64 is the same, except APIC is always compiled in and the nmi watchdog is
>always enabled with perfctr mode. mode=2 seems to also not work correctly currently.
>However one caveat (even for i386): when you use perfctr mode 1 you lose the first
>performance register which you may need for other things.

Andi, you have the numbers mixed up. mode 1 is I/O-APIC, mode 2 is local APIC,
and x86-64 defaults nmi_watchdog to I/O-APIC mode.
Now, is it the I/O-APIC or local APIC watchdog that doesn't work in x86-64?


             reply	other threads:[~2003-07-29 10:37 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-07-29 10:37 Mikael Pettersson [this message]
2003-07-29 16:06 ` [PATCH] NMI watchdog documentation Andi Kleen
2003-07-29 17:53   ` Ville Herva
  -- strict thread matches above, loose matches on Subject: below --
2003-07-31 21:25 Mikael Pettersson
2003-07-30 22:53 Mikael Pettersson
2003-07-31  5:44 ` Ville Herva
2003-07-30 19:20 Mikael Pettersson
2003-07-30 19:40 ` Ville Herva
2003-07-30 19:18 Mikael Pettersson
2003-07-23 17:43 Ville Herva
2003-07-28 17:53 ` Andi Kleen
2003-07-28 19:21   ` Ville Herva

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