linux-kernel - Re: [tip:sched/core] sched: Check for an idle shared cache in select_task_rq

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Message-Id: <1257367035.9923.3.camel@marge.simson.net>
Date:	Wed, 04 Nov 2009 21:37:15 +0100
From:	Mike Galbraith <efault@....de>
To:	arjan@...radead.org, mingo@...hat.com, hpa@...or.com,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	peterz@...radead.org, tglx@...utronix.de, mingo@...e.hu
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:sched/core] sched: Check for an idle shared cache in
 select_task_rq_fair()

On Wed, 2009-11-04 at 19:33 +0000, tip-bot for Mike Galbraith wrote:
> Commit-ID:  a1f84a3ab8e002159498814eaa7e48c33752b04b
> Gitweb:     http://git.kernel.org/tip/a1f84a3ab8e002159498814eaa7e48c33752b04b
> Author:     Mike Galbraith <efault@....de>
> AuthorDate: Tue, 27 Oct 2009 15:35:38 +0100
> Committer:  Ingo Molnar <mingo@...e.hu>
> CommitDate: Wed, 4 Nov 2009 18:46:22 +0100
> 
> sched: Check for an idle shared cache in select_task_rq_fair()
> 
> When waking affine, check for an idle shared cache, and if
> found, wake to that CPU/sibling instead of the waker's CPU.

This one still wants some work.  It's not playing well with 1b9508f.

tip v2.6.32-rc6-1731-gc5bb4b1

mysql+oltp
clients             1          2          4          8         16         32         64        128        256
tip          10447.14   19734.58   36038.18   35776.85   34662.76   33682.30   32256.22   28770.99   25323.23
             10462.61   19580.14   36050.48   35942.63   35054.84   33988.40   32423.89   29259.65   25892.24
             10501.02   19231.27   36007.03   35985.32   35060.79   33945.47   32400.42   29140.84   25716.16
tip avg      10470.25   19515.33   36031.89   35901.60   34926.13   33872.05   32360.17   29057.16   25643.87

tip v2.6.32-rc6-1731-gc5bb4b1 + 1b9508f (Rate-limit newidle)
tip+         10095.64   19989.67   36449.85   35923.98   35024.24   34026.61   32411.75   28965.77   27287.96
             10764.98   19864.03   36632.78   36338.00   35610.52   34439.88   32942.57   29889.18   27426.12
             10734.48   19572.63   36507.90   36236.36   35486.51   34443.86   32938.90   30136.39   27186.61
tip+ avg     10531.70   19808.77   36530.17   36166.11   35373.75   34303.45   32764.40   29663.78   27300.23
                1.005      1.015      1.013      1.007      1.012      1.012      1.012      1.020      1.064

v2.6.32-rc6-1796-gd995f1d (a1f84a3 not playing well with 1b9508f)
             10578.44   19358.96   36184.70   35549.19   34625.40   33658.72   31947.51   27504.11   20400.97
             10610.76   19748.84   36401.08   36021.75   34830.67   33566.52   31989.97   27622.25   21348.00
             10568.87   19600.60   36190.48   35959.96   34805.45   33641.46   32005.30   27591.48   22509.01


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