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Date: Thu, 26 Nov 2009 10:03:53 +0100 From: Jens Axboe <jens.axboe@...cle.com> To: Corrado Zoccolo <czoccolo@...il.com> Cc: Linux-Kernel <linux-kernel@...r.kernel.org>, Jeff Moyer <jmoyer@...hat.com>, Vivek Goyal <vgoyal@...hat.com> Subject: Re: [PATCH 0/4] cfq-iosched: policy fixes On Tue, Nov 24 2009, Corrado Zoccolo wrote: > Hi Jens, > I've collected some bugfixes to the for-2.6.33 branch. > Excluding the NCQ policy fix, that I'm resending with improved changelog, > the bugs were found by Vivek while investingating performance drops > or unfairness while testing cgroups. Nevertheless, those fixes have > general impact, so they should go in before cgroup code is merged: > * no-idle preemption logic was both under/over preempting. > it should preempt only if the active queue is idling due to > no-idle service tree empty > * seeky queues with large depth could steal too much bandwidth to > low depth ones, so they will be marked as idling, and have exclusive > access to disk for their time share > * the idling logic had some corner cases in which idling was not enabled, > even if it should have been, caused by rq_noidle and rq_in_driver checks. > Those were adjusted to better match the original intention. Thanks Corrado, applied all 4! -- Jens Axboe -- 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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