linux-kernel - Re: 2.6.19-rc2-mm1

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Date:	Thu, 19 Oct 2006 09:18:16 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Andi Kleen <ak@...e.de>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.19-rc2-mm1

On 19 Oct 2006 14:32:11 +0200
Andi Kleen <ak@...e.de> wrote:

> Andrew Morton <akpm@...l.org> writes:
> 
> > On Wed, 18 Oct 2006 16:01:05 -0700
> > Badari Pulavarty <pbadari@...ibm.com> wrote:
> > 
> > > > Is the NMI watchdog ticking over?
> > > 
> > > I think so.
> > > 
> > > # dmesg | grep NMI
> > > ACPI: LAPIC_NMI (acpi_id[0x00] high edge lint[0x1])
> > > ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1])
> > > ACPI: LAPIC_NMI (acpi_id[0x02] high edge lint[0x1])
> > > ACPI: LAPIC_NMI (acpi_id[0x03] high edge lint[0x1])
> > > testing NMI watchdog ... OK.
> > 
> > 
> > What does it say in /proc/interrupts?
> > 
> > The x86_64 nmi watchdog handling looks rather complex.
> > 
> > <checks a couple of x86-64 machines>
> > 
> > The /proc/interrutps NMI count seems to be going up by about
> > one-per-minute.  How odd.   Maybe you just need to wait longer.
> 
> That's consistent with a idle machine. The perfctr used by the nmi
> watchdog only increases when the CPU isn't halted and when it's idle
> it's not doing very much.  When something actually loops it should
> increase much faster though.
> 

ok..

What is the reason for not using an apic/lapic NMI source for the watchdog?
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