linux-kernel - Re: [RFC] scheduler: improve SMP fairness in CFS

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Date:	Wed, 25 Jul 2007 10:23:14 -0700 (PDT)
From:	Tong Li <tong.n.li@...el.com>
To:	Ingo Molnar <mingo@...e.hu>
cc:	linux-kernel@...r.kernel.org, Chris Snook <csnook@...hat.com>
Subject: Re: [RFC] scheduler: improve SMP fairness in CFS

On Wed, 25 Jul 2007, Ingo Molnar wrote:

> they now nicely converte to the expected 80% long-term CPU usage.
>
> so, could you please try the patch below, does it work for you too?
>

Thanks for the patch. It doesn't work well on my 8-way box. Here's the 
output at two different times. It's also changing all the time.

[time 1]
  3717 tongli    20   0  7864  108   16 R   85  0.0   1:38.00 loop
  3721 tongli    20   0  7864  108   16 R   85  0.0   1:37.51 loop
  3723 tongli    20   0  7864  108   16 R   84  0.0   1:30.48 loop
  3714 tongli    20   0  7864  108   16 R   83  0.0   1:33.25 loop
  3720 tongli    20   0  7864  108   16 R   81  0.0   1:31.89 loop
  3715 tongli    20   0  7864  108   16 R   78  0.0   1:36.38 loop
  3719 tongli    20   0  7864  108   16 R   78  0.0   1:28.80 loop
  3718 tongli    20   0  7864  108   16 R   78  0.0   1:33.84 loop
  3722 tongli    20   0  7864  108   16 R   76  0.0   1:34.69 loop
  3716 tongli    20   0  7864  108   16 R   70  0.0   1:33.15 loop

[time 2]
  3721 tongli    20   0  7864  108   16 R   91  0.0   1:44.67 loop
  3720 tongli    20   0  7864  108   16 R   89  0.0   1:40.55 loop
  3722 tongli    20   0  7864  108   16 R   86  0.0   1:41.40 loop
  3723 tongli    20   0  7864  108   16 R   82  0.0   1:38.94 loop
  3715 tongli    20   0  7864  108   16 R   82  0.0   1:43.09 loop
  3717 tongli    20   0  7864  108   16 R   79  0.0   1:46.38 loop
  3718 tongli    20   0  7864  108   16 R   79  0.0   1:40.72 loop
  3714 tongli    20   0  7864  108   16 R   77  0.0   1:40.17 loop
  3719 tongli    20   0  7864  108   16 R   73  0.0   1:35.41 loop
  3716 tongli    20   0  7864  108   16 R   61  0.0   1:38.66 loop

I'm running 2.6.23-rc1 with your patch on a two-socket quad-core system. 
Top refresh rate is the default 3s.

   tong
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