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Date: Tue, 03 Nov 2009 11:47:16 +0800
From: Alex Shi <alex.shi@...el.com>
To: linux-kernel@...r.kernel.org
Cc: mingo@...e.hu, "Zhang, Yanmin" <yanmin.zhang@...el.com>
Subject: UDP-U stream performance regression on 32-rc1 kernel
We found the UDP-U 1k/4k stream of netperf benchmark have some
performance regression from 10% to 20% on our Tulsa and some NHM
machines. Bisecting found it is due to the following commitment.
commit 840a0653100dbde599ae8ddf83fa214dfa5fd1aa
Author: Ingo Molnar <mingo@...e.hu>
Date: Fri Sep 4 11:32:54 2009 +0200
sched: Turn on SD_BALANCE_NEWIDLE
Start the re-tuning of the balancer by turning on newidle.
It improves hackbench performance and parallelism on a 4x4 box.
The "perf stat --repeat 10" measurements give us:
domain0 domain1
.......................................
-SD_BALANCE_NEWIDLE -SD_BALANCE_NEWIDLE:
2041.273208 task-clock-msecs # 9.354 CPUs ( +- 0.363% )
+SD_BALANCE_NEWIDLE -SD_BALANCE_NEWIDLE:
2086.326925 task-clock-msecs # 11.934 CPUs ( +- 0.301% )
+SD_BALANCE_NEWIDLE +SD_BALANCE_NEWIDLE:
2115.289791 task-clock-msecs # 12.158 CPUs ( +- 0.263% )
BRGs
Alex
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