linux-kernel - Re: [PATCH 0/3 v2] nmi perf fixes

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Message-ID: <AANLkTi=AceFvNNQmsDYE0MTbOX804P1+mewcr=bAFzXi@mail.gmail.com>
Date:	Mon, 13 Sep 2010 11:54:59 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Don Zickus <dzickus@...hat.com>, mingo@...e.hu,
	robert.richter@....com, fweisbec@...il.com,
	linux-kernel@...r.kernel.org, ying.huang@...el.com,
	ming.m.lin@...el.com, yinghai@...nel.org, andi@...stfloor.org
Subject: Re: [PATCH 0/3 v2] nmi perf fixes

Robert,

I have able to reproduce very easily on:

processor	: 0
vendor_id	: AuthenticAMD
cpu family	: 16
model		: 2
model name	: AMD Phenom(tm) 8450 Triple-Core Processor
stepping	: 3

using:

$ perf record -g ./hackbench 10
Time: 0.415
[ perf record: Woken up 3 times to write data ]
[ perf record: Captured and wrote 0.706 MB perf.data (~30841 samples) ]
$ dmesg | tail
[  418.946001] Uhhuh. NMI received for unknown reason 3d on CPU 0.
[  418.946001] Do you have a strange power saving mode enabled?
[  418.946001] Dazed and confused, but trying to continue

This is with 2.6.36-rc4-tip as of this morning from tip-x86.


On Mon, Sep 13, 2010 at 10:55 AM, Cyrill Gorcunov <gorcunov@...il.com> wrote:
> On Fri, Sep 10, 2010 at 03:52:50PM +0200, Peter Zijlstra wrote:
> ...
>> That seems to be clear enough.. no idea where that extra NMI comes from.
>> Robert any clue?
>>
> ...
>
> For what is worth, I've tested amd turion box -- not affected.
>
>        -- Cyrill
>
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