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SubjectRe: [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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