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Date: Tue, 5 Jun 2007 21:20:41 +0200 From: Ingo Molnar <mingo@...e.hu> To: Bill Davidsen <davidsen@....com> Cc: Linux Kernel M/L <linux-kernel@...r.kernel.org> Subject: Re: glitch1 results - 2.6.21.3-cfs-v15 * Bill Davidsen <davidsen@....com> wrote: > I have added cfs15 to the chart at > www.tmr.com/~davidsen/sched_smooth_05.html and updated the source of > the test at www.tmr.com/~public/source if anyone wants to run test on > their hardware. thanks! > I feel that on my hardware cfs-13 was the smoothest for this test and > for watching videos. Even relatively light load: > nice -10 make -j4 -s > of a kernel would cause jumps on the video, gears or youtube. ah, found this bug i think! Does the patch below fix it for you and does it bring back v13's smoothness for the reniced kernel build? Ingo Index: linux/kernel/sched_fair.c =================================================================== --- linux.orig/kernel/sched_fair.c +++ linux/kernel/sched_fair.c @@ -385,6 +374,7 @@ static void enqueue_sleeper(struct rq *r * during the whole sleep period: */ delta_fair = div64_s(delta_fair * load, load + p->load_weight); + delta_fair = div64_s(delta_fair * p->load_weight, NICE_0_LOAD); prev_runtime = p->wait_runtime; __add_wait_runtime(rq, p, delta_fair); - 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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