Messages in this thread | | | Date | Tue, 02 Aug 2005 08:43:50 -0700 | From | "Martin J. Bligh" <> | Subject | Re: [PATCH] POWER 4 fails to boot with NUMA |
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--Sonny Rao <sonny@burdell.org> 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 <kravetz@us.ibm.com> >> >> 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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