[Beowulf] Barcelona hardware error: how to detect
kus at free.net
Thu Jun 5 11:22:36 PDT 2008
In message from "Jason Clinton" <jclinton at advancedclustering.com>
(Thu, 5 Jun 2008 13:16:33 -0500):
>On Thu, Jun 5, 2008 at 1:09 PM, Mikhail Kuzminsky <kus at free.net>
>> In message from Mark Hahn <hahn at mcmaster.ca> (Thu, 5 Jun 2008
>> -0400 (EDT)):
>>> I'm mystified by this: B2 was broken, so using it without the bios
>>> workaround is just a mistake or masochism. the workaround _did_
>>> have performance implications, but that's why B3 exists...
>>> do you mean you know of G03 problems on B2 systems which are
>>> _with_ the workaround?
>> I don't know exactly, but I think the crash was under absence of
>> workaround, because I was not informed that there was some kernel
>> BIOS changes. This was interesting for me also, because I have no
>> information how this hardware problem may be affected in the "real
>The B2 BIOS work-around is to disable the L3 cache which gives you a
>performance hit with no reduction in power consumption.
>The kernel patch is very extensive and, last I heard, under NDA. AMD
>said publicly that the patch gives you a 1-2% performance hit.
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