From: Con Kolivas <kernel@kolivas.org>
The smt-nice handling is a little too aggressive by not estimating the per cpu
gain as high enough for pentium4 hyperthread. This patch changes the per
sibling cpu gain from 15% to 25%. The true per cpu gain is entirely dependant
on the workload but overall the 2 species of Pentium4 that support
hyperthreading have about 20-30% gain.
P.S: Anton - For the power processors that are now using this SMT nice
infrastructure it would be worth setting this value separately at 40%.
Signed-off-by: Con Kolivas <kernel@kolivas.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
25-akpm/include/linux/sched.h | 2 +-
1 files changed, 1 insertion(+), 1 deletion(-)
diff -puN include/linux/sched.h~sched-adjust-p4-per-cpu-gain include/linux/sched.h
--- 25/include/linux/sched.h~sched-adjust-p4-per-cpu-gain 2004-08-01 23:00:37.499832096 -0700
+++ 25-akpm/include/linux/sched.h 2004-08-01 23:00:37.503831488 -0700
@@ -621,7 +621,7 @@ struct sched_domain {
.imbalance_pct = 110, \
.cache_hot_time = 0, \
.cache_nice_tries = 0, \
- .per_cpu_gain = 15, \
+ .per_cpu_gain = 25, \
.flags = SD_BALANCE_NEWIDLE \
| SD_BALANCE_EXEC \
| SD_WAKE_AFFINE \
_