Re: PXM/Nid/SLIT patch

From: Robert Picco <>
Date: 2004-02-19 05:56:48
Christoph Hellwig wrote:

>On Wed, Feb 18, 2004 at 10:33:29AM -0500, Robert Picco wrote:
>>This PXM value (255) isn't a SLIT or PXM defined quantity.  It is really 
>>specific to HP cell machines.  For example, a machine configured with 
>>two cells will report three PXMs.  Two for the CPUs and one for the 
>>interleaved memory at magic PXM 255.  The firmware doesn't report SLIT 
>>information for PXM 255. The patch approximates the SLIT value for PXM 
>>255. I have attempted to arrive at code which doesn't break non-HP 
>>hardware configurations. I have assumed the way the initialization code 
>>was written that all NIDs require memory.  Otherwise 
>>reserve_pernode_space will fail.
>I know HP basically owns the IA64 ports, but honestly can't you fix
>the firmware to return sane information instead?  i.e. move the above
>fix to firmware instead of letting linux fixup the reported data.
Well some of us would like to see this too.  Some legacy requirements 
from our other supported OSes require this to be the default 
configuration.  Perhaps a different default can be made in the future or 
some IPMI tool to change the default.

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Received on Wed Feb 18 15:28:09 2004

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