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

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Date:	Fri, 06 Mar 2009 07:51:40 +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 07:37 +0100, Mike Galbraith wrote:
> 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.

Ah, my woes are gonna be 2743a5b0fa6f309da904f2190a9cc25deee34dbd.

Never mind.

	-Mike

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