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Date: Fri, 13 May 2011 15:13:26 +0200 From: Mike Galbraith <efault@....de> To: Ingo Molnar <mingo@...e.hu> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>, Yong Zhang <yong.zhang0@...il.com>, Carl-Johan Kjellander <carl-johan@...rna.com>, linux-kernel@...r.kernel.org Subject: Re: Sched_autogroup and niced processes On Fri, 2011-05-13 at 12:04 +0200, Ingo Molnar wrote: > Still, the other important problem is that we still seem to have a bug, even > with the cgroup set to low prio seti@...e is sucking up CPU resources ... I don't see how. Other than the expected nice 19 overrun when nice 0 group blocks, it works fine on my little Q6600 box. time make -j4 vmlinux (cache hot) real 2m22.996s user 7m6.887s sys 0m48.999s echo 0 > sched_autogroup_enabled time make -j4 vmlinux real 2m17.052s (darn, no free lunch) user 7m5.483s sys 0m49.415s echo 1 > sched_autogroup_enabled simultaneous massive_intr 8 9999 in nice 19 autogroup and time make -j4 vmlinux in a nice 0 autogroup real 2m30.863s user 7m5.363s sys 0m47.359s 142.996/150.863 = .947 (a tad low) repeat with 2 kbuild tasks/core to cut nice 0 group's idle time time make -j8 vmlinux real 2m24.925s user 7m16.327s sys 0m50.807s 142.996/144.925 = .986 (all better) -Mike -- 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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