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

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Message-Id: <1257370917.11327.7.camel@marge.simson.net>
Date:	Wed, 04 Nov 2009 22:41:57 +0100
From:	Mike Galbraith <efault@....de>
To:	arjan@...radead.org
Cc:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	stable@...nel.org, peterz@...radead.org, tglx@...utronix.de,
	mingo@...e.hu, 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 21:37 +0100, Mike Galbraith wrote:
> 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.

Still does want some work (on the tail), but those numbers were from a
failed experiment kernel, not d995f1d.  Below are the correct numbers.

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
             10745.30   19684.71   36367.25   35890.25   34598.08   33672.37   32327.99   28744.09   25393.00
             10549.41   19747.85   36778.96   36410.58   35531.90   34292.03   32603.66   29487.77   25351.09
             10678.30   19944.74   36789.44   36403.78   35523.40   34267.10   32659.60   29359.59   25751.93
avg          10657.67   19792.43   36645.21   36234.87   35217.79   34077.16   32530.41   29197.15   25498.67
vs c5bb4b1      1.017      1.014      1.017      1.009      1.008      1.006      1.005       1.004      .994

Lost the tail gain, gained peak.  Drink one, spill one, give one away.

	-Mike

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