--Sonny Rao <[email protected]> wrote (on Monday, August 01, 2005 02:23:22 -0400):
> 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 :-)
Yeah, I have a p650 that's set up similarly .... I thought the auto-test
stuff was covering that, but it seems NUMA is not turned on for that box
like I thought it was. will fix ....
M.
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