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Date: Tue, 27 May 2008 12:13:46 -0600 From: "Chris Friesen" <cfriesen@...tel.com> To: vatsa@...ux.vnet.ibm.com CC: linux-kernel@...r.kernel.org, mingo@...e.hu, a.p.zijlstra@...llo.nl, pj@....com, Balbir Singh <balbir@...ibm.com>, aneesh.kumar@...ux.vnet.ibm.com, dhaval@...ux.vnet.ibm.com Subject: Re: fair group scheduler not so fair? Srivatsa Vaddagiri wrote: > But first, note that Groups "a" and "b" share bandwidth with all tasks > in /dev/cgroup/tasks. Ah, good point. I've switched over to your group setup for testing. > The following experimental patch (on top of 2.6.26-rc3 + > http://programming.kicks-ass.net/kernel-patches/sched-smp-group-fixes/) seems > to fix the problem. > Can you check if this makes a difference for you as well? Initially it looked promising. I put pid 2498 in group A, and pids 2499 and 2500 in group B. 2498 got basically a full cpu, and the other two got 50% each. However, I then moved pid 2499 from group B to group A, and the system got stuck in the following behaviour: 2498 cfriesen 20 0 3800 392 336 R 99.7 0.0 3:00.22 cat 2500 cfriesen 20 0 3800 392 336 R 66.7 0.0 1:39.10 cat 2499 cfriesen 20 0 3800 392 336 R 33.0 0.0 1:24.31 cat I reproduced this a number of times. Chris -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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