From: Anton Blanchard Date: Sun, 24 Jul 2011 16:33:12 +0000 (+0000) Subject: powerpc/numa: Enable SD_WAKE_AFFINE in node definition X-Git-Url: http://git.efficios.com/?a=commitdiff_plain;h=a200d8e44649de2cbb39de95f42ad4ef5dc8dc22;p=deliverable%2Flinux.git powerpc/numa: Enable SD_WAKE_AFFINE in node definition When chasing a performance issue on ppc64, I noticed tasks communicating via a pipe would often end up on different nodes. It turns out SD_WAKE_AFFINE is not set in our node defition. Commit 9fcd18c9e63e (sched: re-tune balancing) enabled SD_WAKE_AFFINE in the node definition for x86 and we need a similar change for ppc64. I used lmbench lat_ctx and perf bench pipe to verify this fix. Each benchmark was run 10 times and the average taken. lmbench lat_ctx: before: 66565 ops/sec after: 204700 ops/sec 3.1x faster perf bench pipe: before: 5.6570 usecs after: 1.3470 usecs 4.2x faster Signed-off-by: Anton Blanchard Signed-off-by: Benjamin Herrenschmidt --- diff --git a/arch/powerpc/include/asm/topology.h b/arch/powerpc/include/asm/topology.h index 7ef0d90defc8..6a7e7251cc02 100644 --- a/arch/powerpc/include/asm/topology.h +++ b/arch/powerpc/include/asm/topology.h @@ -73,7 +73,7 @@ static inline int pcibus_to_node(struct pci_bus *bus) | 1*SD_BALANCE_EXEC \ | 1*SD_BALANCE_FORK \ | 0*SD_BALANCE_WAKE \ - | 0*SD_WAKE_AFFINE \ + | 1*SD_WAKE_AFFINE \ | 0*SD_PREFER_LOCAL \ | 0*SD_SHARE_CPUPOWER \ | 0*SD_POWERSAVINGS_BALANCE \