Mel Gorman wrote:

> If you send me patches to apply on top of 2.6.25-rc1, I'll give them a spin
> on the machine in question. Reverting didn't work out very well as there are
> too many collisions with patches that were applied later. I eventually got
> the machine booting but it only succeeds because it only brings up one core
> on each processor.  The patch, which is pretty brain damaged is below in case
> it helps you guess what the real problem is. dmesg logs are attached of the
> vanilla failure with acpi=debug and the log with the patch applied showing
> "__cpu_up: bad cpu 1" and "__cpu_up: bad cpu3" (i.e. the second cores of
> each machine).
> 

This should completely undo the change to 16 bit apic ids until we can figure
out the problem with the memory-less nodes.  I checked it on both the numa
and non-numa x86_64 box.

Thanks,
Mike