| Date | Tue, 30 Mar 2010 15:48:38 -0700 | From | Greg KH <> | Subject | [18/45] sched: fine-tune SD_SIBLING_INIT |
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2.6.27-stable review patch. If anyone has any objections, please let us know.
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From: Ingo Molnar <mingo@elte.hu>
commit 52c642f33b14bfa1b00ef2b68296effb34a573f3 upstream.
fine-tune the HT sched-domains parameters as well.
On a HT capable box, this increases lat_ctx performance from 23.87 usecs to 1.49 usecs:
# before
$ ./lat_ctx -s 0 2
"size=0k ovr=1.89 2 23.87
# after
$ ./lat_ctx -s 0 2
"size=0k ovr=1.84 2 1.49
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- include/linux/topology.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/linux/topology.h +++ b/include/linux/topology.h @@ -99,7 +99,7 @@ void arch_update_cpu_topology(void); | SD_BALANCE_FORK \ | SD_BALANCE_EXEC \ | SD_WAKE_AFFINE \ - | SD_WAKE_IDLE \ + | SD_WAKE_BALANCE \ | SD_SHARE_CPUPOWER, \ .last_balance = jiffies, \ .balance_interval = 1, \
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