From d4761ad2ef18ec2c9a0037d6649c0afc4a7b907d Mon Sep 17 00:00:00 2001 From: Anton Blanchard Date: Sun, 24 Jul 2011 16:33:14 +0000 Subject: [PATCH] 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 Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/include/asm/topology.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/powerpc/include/asm/topology.h b/arch/powerpc/include/asm/topology.h index 6a7e7251cc02..d1c1d312f808 100644 --- a/arch/powerpc/include/asm/topology.h +++ b/arch/powerpc/include/asm/topology.h @@ -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 static inline int cpu_to_node(int cpu) -- 2.20.1