Date: Wed, 25 Aug 2010 13:02:18 +0200
From: Robert Richter <robert.richter@amd.com>
To: Ingo Molnar <mingo@elte.hu>
CC: Don Zickus <dzickus@redhat.com>, Peter Zijlstra <peterz@infradead.org>,
        Cyrill Gorcunov <gorcunov@gmail.com>, Lin Ming <ming.m.lin@intel.com>,
        "fweisbec@gmail.com" <fweisbec@gmail.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "Huang, Ying" <ying.huang@intel.com>, Yinghai Lu <yinghai@kernel.org>,
        Andi Kleen <andi@firstfloor.org>
Subject: Re: [PATCH -v3] perf, x86: try to handle unknown nmis with running
 perfctrs
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 <20100820152510.GA4167@elte.hu>
 <20100825094819.GB3198@erda.amd.com>
 <20100825104130.GA27891@elte.hu>
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On 25.08.10 06:41:30, Ingo Molnar wrote:

> > > > > Uhhuh. NMI received for unknown reason 00 on CPU 9.
> > > > > Do you have a strange power saving mode enabled?
> > > > > Dazed and confused, but trying to continue
> 
> Before the two patches i did not get these messages at all, on any of 
> the systems.

Yes, because all were eaten by NOTIFY_STOP, and that's why we also
lose NMIs from other sources, like the nmi button. The patches try to
fix this.

-Robert

-- 
Advanced Micro Devices, Inc.
Operating System Research Center

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