Message-ID: <51A4B19A.5090500@intel.com>
Date: Tue, 28 May 2013 21:31:06 +0800
From: Alex Shi <alex.shi@intel.com>
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To: Michael Wang <wangyun@linux.vnet.ibm.com>, mingo@redhat.com,
        peterz@infradead.org, pjt@google.com
CC: tglx@linutronix.de, akpm@linux-foundation.org, bp@alien8.de,
        namhyung@kernel.org, efault@gmx.de, morten.rasmussen@arm.com,
        vincent.guittot@linaro.org, preeti@linux.vnet.ibm.com,
        viresh.kumar@linaro.org, linux-kernel@vger.kernel.org, mgorman@suse.de,
        riel@redhat.com
Subject: Re: [patch 0/8]: use runnable load avg in balance
References: <1368199049-2798-1-git-send-email-alex.shi@intel.com> <51948AD4.3020104@linux.vnet.ibm.com>
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On 05/16/2013 03:29 PM, Michael Wang wrote:
>> > This version changed the runnable load avg value setting for new task
>> > in patch 3rd.
>> > 
>> > We also tried to include blocked load avg in balance. but find many benchmark
>> > performance dropping. Guess the too bigger cpu load drive task to be waken
>> > on remote CPU, and cause wrong decision in periodic balance.
>> > 
>> > I retested on Intel core2, NHM, SNB, IVB, 2 and 4 sockets machines with
>> > benchmark kbuild, aim7, dbench, tbench, hackbench, oltp, and netperf loopback
>> > etc. The performance is better now. 
>> > 
>> > On SNB EP 4 sockets machine, the hackbench increased about 50%, and result
>> > become stable. on other machines, hackbench increased about 2~10%.
>> > oltp increased about 30% in NHM EX box.
>> > netperf loopback also increased on SNB EP 4 sockets box.
>> > no clear changes on other benchmarks.
>> > 
>> > Michael Wang had tested previous version on pgbench on his box:
>> > https://lkml.org/lkml/2013/4/2/1022
> Tested the latest patch set (new 3/8 and 6/8) with pgbench, tip
> 3.10.0-rc1 and 12 cpu X86 box, works well and still benefit ;-)


Paul:

Would you like to give more comments/ideas of this patch set?

-- 
Thanks
    Alex
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