[PATCH] powerpc: Fix database regression due to scheduler changes

PowerPC's NUMA domain doesn't currently set up some of the newer
sched-domains parameters.

Brian Twichell <tbrian@us.ibm.com> discovered and diagnosed a 1.5% OLTP
database regression on a 4 core POWER5 system that was due to the use of
NUMA scheduling on ppc64.

This patch applies some saneish values to the parameters, in line with
other architectures. This solves the regression.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/include/asm-powerpc/topology.h b/include/asm-powerpc/topology.h
index 015d28746e1b0a8e0590db4fcd80c991570d2295..0e8c20c96062fc4556dd7a97c5802924b9c7eecd 100644 (file)
--- a/include/asm-powerpc/topology.h
+++ b/include/asm-powerpc/topology.h
@@ -41,6 +41,10 @@ static inline int node_to_first_cpu(int node)
        .cache_hot_time         = (10*1000000),         \
        .cache_nice_tries       = 1,                    \
        .per_cpu_gain           = 100,                  \
+       .busy_idx               = 3,                    \
+       .idle_id                = 1,                    \
+       .newidle_idx            = 2,                    \
+       .wake_idx               = 1,                    \
        .flags                  = SD_LOAD_BALANCE       \
                                | SD_BALANCE_EXEC       \
                                | SD_BALANCE_NEWIDLE    \