Re: [tip:sched/core] sched: Check for an idle shared cache in select_task_rq_fair()

Mike Galbraith
2009-11-04T21:45:30Z

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@gmx.de>
> > AuthorDate: Tue, 27 Oct 2009 15:35:38 +0100
> > Committer: Ingo Molnar <mingo@elte.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