From: Mikael Pettersson <mikpe@csd.uu.se>
To: vherva@niksula.hut.fi
Cc: ak@suse.de, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] NMI watchdog documentation
Date: Thu, 31 Jul 2003 00:53:00 +0200 (MEST) [thread overview]
Message-ID: <200307302253.h6UMr0XW024175@harpo.it.uu.se> (raw)
On Wed, 30 Jul 2003 22:40:52 +0300, Ville Herva wrote:
>Ok, you got me confused (thankfully I didn't submit anything for inclusion
>yet. :)
...
>So... Should it be something like:
>
>+For x86-64, the needed APIC is always compiled in, and the NMI watchdog is
>+always enabled with perctr mode. Currently, mode=2 (local APIC) does not
always enabled with I/O-APIC mode.
>+work on x86-64. IO APIC mode (mode=1) is the default. Using NMI watchdog
Using local APIC
>+(mode=1) needs the first performance register, so you can't use it for
(mode=2)
>+other purposes (such as high precision performance profiling.)
>(Is the last sentence only valid for x86-64?)
No, it's true for both x86 and x86-64. However, both oprofile
and the perfctr driver disable the local APIC NMI watchdog, so
the statement is only true for other drivers that don't do this.
/Mikael
next reply other threads:[~2003-07-30 22:53 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-30 22:53 Mikael Pettersson [this message]
2003-07-31 5:44 ` [PATCH] NMI watchdog documentation Ville Herva
-- strict thread matches above, loose matches on Subject: below --
2003-07-31 21:25 Mikael Pettersson
2003-07-30 19:20 Mikael Pettersson
2003-07-30 19:40 ` Ville Herva
2003-07-30 19:18 Mikael Pettersson
2003-07-29 10:37 Mikael Pettersson
2003-07-29 16:06 ` Andi Kleen
2003-07-29 17:53 ` Ville Herva
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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