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

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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>
This commit is contained in:
Nick Piggin 2005-11-16 23:37:53 +11:00 • committed by Paul Mackerras
commit 5cfccd7f13
1 changed files with 4 additions and 0 deletions
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4
include/asm-powerpc/topology.h
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@ -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 \