Messages in this thread | | | Date | Thu, 29 May 2008 08:20:39 +0530 | From | Srivatsa Vaddagiri <> | Subject | Re: fair group scheduler not so fair? |
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On Wed, May 28, 2008 at 12:35:19PM -0600, Chris Friesen wrote: > Srivatsa Vaddagiri wrote: > >> We seem to be skipping the last element in the task list always. In your >> case, the lone task in Group a/b is always skipped because of this. > >> Updated patch (on top of 2.6.26-rc3 + >> http://programming.kicks-ass.net/kernel-patches/sched-smp-group-fixes/) >> below. Pls let me know how it fares! > > Looking much better, but still some fairness issues with more complex > setups. > [snip]
> A 10-sec average was better, but we still see errors of 6%: > 2478 72.8% > 2477 64.0% > 2479 63.2%
Yes I have observed that the delta from ideal fairness is much more than desirable (although I used to get much better fairness with 2.6.25-rc1. Let me verify and get back).
-- Regards, vatsa
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