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Date: Tue, 6 Apr 2010 15:55:56 -0500 (CDT)
From: Christoph Lameter <cl@linux-foundation.org>
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To: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
cc: Tejun Heo <tj@kernel.org>, Pekka Enberg <penberg@cs.helsinki.fi>,
       alex.shi@intel.com,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
       "Ma, Ling" <ling.ma@intel.com>, "Chen, Tim C" <tim.c.chen@intel.com>,
       Andrew Morton <akpm@linux-foundation.org>
Subject: Re: hackbench regression due to commit 9dfc6e68bfe6e
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We cannot reproduce the issue here. Our tests here (dual quad dell) show a
performance increase in hackbench instead.

Linux 2.6.33.2 #2 SMP Mon Apr 5 11:30:56 CDT 2010 x86_64 GNU/Linux
./hackbench 100 process 200000
Running with 100*40 (== 4000) tasks.
Time: 3102.142
./hackbench 100 process 20000
Running with 100*40 (== 4000) tasks.
Time: 308.731
./hackbench 100 process 20000
Running with 100*40 (== 4000) tasks.
Time: 311.591
./hackbench 100 process 20000
Running with 100*40 (== 4000) tasks.
Time: 310.200
./hackbench 10 process 20000
Running with 10*40 (== 400) tasks.
Time: 38.048
./hackbench 10 process 20000
Running with 10*40 (== 400) tasks.
Time: 44.711
./hackbench 10 process 20000
Running with 10*40 (== 400) tasks.
Time: 39.407
./hackbench 1 process 20000
Running with 1*40 (== 40) tasks.
Time: 9.411
./hackbench 1 process 20000
Running with 1*40 (== 40) tasks.
Time: 8.765
./hackbench 1 process 20000
Running with 1*40 (== 40) tasks.
Time: 8.822

Linux 2.6.34-rc3 #1 SMP Tue Apr 6 13:30:34 CDT 2010 x86_64 GNU/Linux
./hackbench 100 process 200000
Running with 100*40 (== 4000) tasks.
Time: 3003.578
./hackbench 100 process 20000
Running with 100*40 (== 4000) tasks.
Time: 300.289
./hackbench 100 process 20000
Running with 100*40 (== 4000) tasks.
Time: 301.462
./hackbench 100 process 20000
Running with 100*40 (== 4000) tasks.
Time: 301.173
./hackbench 10 process 20000
Running with 10*40 (== 400) tasks.
Time: 41.191
./hackbench 10 process 20000
Running with 10*40 (== 400) tasks.
Time: 41.964
./hackbench 10 process 20000
Running with 10*40 (== 400) tasks.
Time: 41.470
./hackbench 1 process 20000
Running with 1*40 (== 40) tasks.
Time: 8.829
./hackbench 1 process 20000
Running with 1*40 (== 40) tasks.
Time: 9.166
./hackbench 1 process 20000
Running with 1*40 (== 40) tasks.
Time: 8.681