linux-kernel - Re: NMI watchdog

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Message-ID: <20071012100043.GA28777@atjola.homenet>
Date:	Fri, 12 Oct 2007 12:00:43 +0200
From:	Björn Steinbrink <B.Steinbrink@....de>
To:	John Sigler <linux.kernel@...e.fr>
Cc:	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: Re: NMI watchdog

On 2007.10.12 11:18:24 +0200, John Sigler wrote:
> Hello,
>
> I'm experiencing a full system lockup. I'm using an out-of-tree driver 
> which I suspect is responsible. I'm trying to enable the NMI watchdog.
>
> # cat /proc/version
> Linux version 2.6.22.1-rt9 (gcc version 3.4.6) #1 PREEMPT RT Tue Oct 9 
> 12:25:47 CEST 2007
>
> # cat /proc/cmdline
> ro root=/dev/hdc1 console=ttyS0,57600n8 console=tty0 panic=3 apic=debug 
> nmi_watchdog=2
>
> However, after boot, the NMI count does not change.
>
> # cat /proc/interrupts ; sleep 10 ; cat /proc/interrupts

Try running some cpu hog in the background. The performance counters get
increased only when the CPU is actually doing something. On a mostly
idle system, it can take quite a while for the next NMI to show up.

Björn
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