linux-kernel - Re: [PATCH] perfcounters: IRQ and NMI support on AMD CPUs

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Message-Id: <1236321473.6030.8.camel@marge.simson.net>
Date:	Fri, 06 Mar 2009 07:37:53 +0100
From:	Mike Galbraith <efault@....de>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Paul Mackerras <paulus@...ba.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perfcounters: IRQ and NMI support on AMD CPUs

On Fri, 2009-03-06 at 01:31 +0530, Jaswinder Singh Rajput wrote:
> On Thu, 2009-03-05 at 20:41 +0100, Ingo Molnar wrote:
> > * Peter Zijlstra <peterz@...radead.org> wrote:
> > 
> > > On Fri, 2009-03-06 at 00:26 +0530, Jaswinder Singh Rajput wrote:
> > > 
> > > > But kerneltop is still not working and I am not getting any NMI Interrupts.
> > > 
> > > Does the below work for you?
> > > 
> > > The BKGD suggests its 48 for all existing machines (it 
> > > certainly is for mine).
> > 
> > Yeah, this did the trick on AMD/Barcelona!
> > 
> 
> Nice.
> 
> but on my AMD box I got interrupts and NMI for some time:
> 
> NMI:        100    1108209   Non-maskable interrupts
> LOC:        213     192815   Local timer interrupts
> CNT:        100    1108206   Performance counter interrupts
> RES:      21132      20397   Rescheduling interrupts
> 
> but kerneltop does not show anything, it only shows # irqs/sec for some
> time and then irqs also become 0.

Hm.  Kerneltop on my Q6600 has ceased to function with n 1 as well, but
n 0 still works.  Zero NMIs.

Perfstat has also gone south.
perfstat: perfstat.c:423: main: Assertion `res == sizeof(single_count)' failed.

	-Mike

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