NMI received for unknown reason 29 on CPU 0.

[Mitja Mihelic]

We're running FC4 with the 2.6.16-1.2115_FC4 kernel on an Intel based 
server with a 3GHz P4 HT CPU.
It runs OK for a while and then it starts to output messages at the rate 
of about 65 per second, and then it freezes.

Here's a sample output:

Sep  4 10:39:26 camserver kernel: Do you have a strange power saving 
mode enabled?
Sep  4 10:39:26 camserver kernel: Uhhuh. NMI received for unknown reason 
29 on CPU 0.
Sep  4 10:39:26 camserver kernel: Dazed and confused, but trying to continue
Sep  4 10:39:26 camserver kernel: Do you have a strange power saving 
mode enabled?
Sep  4 10:39:26 camserver kernel: Uhhuh. NMI received for unknown reason 
39 on CPU 0.
Sep  4 10:39:26 camserver kernel: Dazed and confused, but trying to continue
Sep  4 10:39:26 camserver kernel: Do you have a strange power saving 
mode enabled?


The obvious question is: what is this thing anyway, and how do we make 
it go away ?

Thanks.

--
Mitja