[Beowulf] Performance issue - CPU Intel 00/02

John Hearns john.hearns at streamline-computing.com
Wed Jul 20 13:27:47 EDT 2005


On Wed, 2005-07-20 at 08:40 -0700, David Mathog wrote:

> 
> It seems likely that the Tyan board may be doing something
> similar.  Try getting into the BIOS on one of these and see what
> it's done to the clock speed.  Unfortunately for the Asus boards
> the only way to fix this is in the BIOS using the keyboard.  That
> would be rather painful if you had 300 nodes to deal with.  You
> might want to see if there is a switch in the Tyan BIOS to disable
> this feature.
I agree with what Dave says.

If you have lots of sick machines, you could try making BIOS
settings using the nvram module

On a good node: modprobe nvram; cat /dev/nvram >  biosfile

On a bad one: modprobe nvram; cat biosfile > /dev/nvram

YMMV. The management accept no liability for lost bits.
Seriously, give it a try on one node.

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