From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefan Pietsch <stefan.pietsch@lsexperts.de>
Subject: Re: kernel 3.10.1 - "NMI received for unknown reason"
Date: Fri, 02 Aug 2013 08:24:38 +0200
Message-ID: <51FB50A6.3040504@sp.consulting.lsexperts.de>
References: <51F2BF0F.5060404@sp.consulting.lsexperts.de> <20130726183910.GC3482@redhat.com> <51F6315F.4050205@sp.consulting.lsexperts.de> <20130729091637.GA18009@redhat.com> <51F6D578.5030105@sp.consulting.lsexperts.de> <20130730053134.GG28372@redhat.com> <51F8D469.3050104@sp.consulting.lsexperts.de> <20130731092012.GC7484@redhat.com>
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To: Gleb Natapov <gleb@redhat.com>
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On 31.07.2013 11:20, Gleb Natapov wrote:
> On Wed, Jul 31, 2013 at 11:10:01AM +0200, Stefan Pietsch wrote:
>> On 30.07.2013 07:31, Gleb Natapov wrote:
>>
>>> What happen if you run perf on your host (perf record -a)?
>>> Do you see same NMI messages?
>>
>> It seems that "perf record -a" triggers some delayed NMI messages.
>> They appear about 20 or 30 minutes after the command. This seems strange.
> Definitely strange. KVM guest is not running in parallel, correct? 20, 30
> minutes after perf stopped running or it is running all of the time?

No, the KVM guest ist not running in parallel. But I'm not able to
clearly reproduce the NMI messages with "perf record".
I start "perf record -a" and after some minutes I stop the recording.

After that it seems NMI messages appear within a random period of time.
So, I cannot tell what triggers the messages.