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 <an...@samba.org> --- Index: linux-2.6-work/arch/powerpc/include/asm/topology.h =================================================================== --- linux-2.6-work.orig/arch/powerpc/include/asm/topology.h 2011-07-25 11:43:24.954093179 +1000 +++ linux-2.6-work/arch/powerpc/include/asm/topology.h 2011-07-25 11:43:31.274205122 +1000 @@ -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) _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
