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SubjectOpteron 128GB NODMAPSIZE too small?
While running SuSE Linux 10.0 (x86_64) with a vanilla 2.6.16.1 on an
8way (8 sockets) Opteron equipped with 128GB (16GB per socket) of memory
I found this in dmesg.

Any guesses to which value I should set NODEMAPSIZE?
Currently it is 0xfff (from 'include/asm-x86_64/mmzone.h')

Scanning NUMA topology in Northbridge 24
Number of nodes 8
Node 0 MemBase 0000000000000000 Limit 0000000422000000
Node 1 MemBase 0000000422000000 Limit 0000000822000000
Node 2 MemBase 0000000822000000 Limit 0000000c22000000
Node 3 MemBase 0000000c22000000 Limit 0000001022000000
Node 4 MemBase 0000001022000000 Limit 0000001422000000
Node 5 MemBase 0000001422000000 Limit 0000001822000000
Node 6 MemBase 0000001822000000 Limit 0000001c22000000
Node 7 MemBase 0000001c22000000 Limit 0000002022000000
NUMA: Using 25 for the hash shift.
Your memory is not aligned you need to rebuild your kernel with a bigger
NODEMAPSIZE shift=25
No NUMA node hash function found. Contact maintainer
No NUMA configuration found
Faking a node at 0000000000000000-0000002022000000
Bootmem setup node 0 0000000000000000-0000002022000000


Regards,
Oliver Weihe

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