On Mon, Aug 01, 2005 at 12:27:42AM -0500, Paul Mackerras wrote:
> From: Mike Kravetz <[email protected]>
>
> If CONFIG_NUMA is set, some POWER 4 systems will fail to boot. This is
> because of special processing needed to handle invalid node IDs (0xffff)
> on POWER 4. My previous patch to handle memory 'holes' within nodes
> forgot to add this special case for POWER 4 in one place.
>
> In reality, I'm not sure that configuring the kernel for NUMA on POWER 4
> makes much sense. Are there POWER 4 based systems with NUMA characteristics
> that are presented by the firmware? But, distros want one kernel for all
> systems so NUMA is on by default in their kernels. The patch handles those
> cases.
IIRC, In SMP mode the NUMA topology is exported. I've tried this on a
p690 and it worked correctly on older kernels (2.6.10 or 2.6.11)
I also noticed a nice speedup on a few things compared to LPAR mode :-)
Sonny
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