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powerpc/numa: Increase SD_NODES_PER_DOMAIN to 32. 

The largest POWER7 boxes have 32 nodes. SD_NODES_PER_DOMAIN groups
nodes into chunks of 16 and adds a global balancing domain
(SD_ALLNODES) above it.

If we bump SD_NODES_PER_DOMAIN to 32, then we avoid this extra
level of balancing on our largest boxes.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Anton Blanchard 2011-07-24 16:33:14 +00:00 committed by Benjamin Herrenschmidt
parent 590e4d8571
commit d4761ad2ef
1 changed files with 6 additions and 0 deletions
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6
arch/powerpc/include/asm/topology.h
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@ -28,6 +28,12 @@ struct device_node;
*/
#define RECLAIM_DISTANCE 10
/*
* Avoid creating an extra level of balancing (SD_ALLNODES) on the largest
* POWER7 boxes which have a maximum of 32 nodes.
*/
#define SD_NODES_PER_DOMAIN 32
#include <asm/mmzone.h>
static inline int cpu_to_node(int cpu)