9.0 spontaneously reboots

Matthew Seaman matthew at FreeBSD.org
Tue Mar 13 10:24:54 UTC 2012

On 13/03/2012 08:59, Volodymyr Kostyrko wrote:
> The only other weird thing about this server is:
> dev.cpu.0.temperature: 37,0C
> dev.cpu.1.temperature: 37,0C
> dev.cpu.2.temperature: 35,0C
> dev.cpu.3.temperature: 35,0C
> dev.cpu.4.temperature: 43,0C
> dev.cpu.5.temperature: 43,0C
> dev.cpu.6.temperature: 38,0C
> dev.cpu.7.temperature: 38,0C
> dev.cpu.8.temperature: 38,0C
> dev.cpu.9.temperature: 38,0C
> dev.cpu.10.temperature: 37,0C
> dev.cpu.11.temperature: 37,0C
> dev.cpu.12.temperature: 33,0C
> dev.cpu.13.temperature: 33,0C
> dev.cpu.14.temperature: 34,0C
> dev.cpu.15.temperature: 34,0C
> And it's consistent - cores 4 and 5 always are hotter then any other.
> This can be something with scheduler, however this started before any
> actual load. Though numbers are normal I had never seen something alike...

Two cores per socket, and 8 sockets on the board?  If so, that looks
absolutely fine to me.  The average temperature is 36.8C but 43.0C is
still well within spec.  That difference of just over 6 degrees is not
really significant and probably entirely due to different airflow
patterns over the different CPU sockets.  If you swap the CPU package in
that socket with one of the other ones, you'll find the hot spot stays
put.  You might be able to even things out by rerouteing cables, but
really it's not worth the hassle and won't make any perceptible
difference to performance.



Dr Matthew J Seaman MA, D.Phil.
PGP: http://www.infracaninophile.co.uk/pgpkey

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