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Message-ID: <20070425180813.GI4730@kernel.dk> Date: Wed, 25 Apr 2007 20:08:13 +0200 From: Jens Axboe <jens.axboe@...cle.com> To: Alan.Brunelle@...ox.com Cc: linux-kernel@...r.kernel.org Subject: Re: [PATCH 5/15] cfq-iosched: speed up rbtree handling On Wed, Apr 25 2007, Jens Axboe wrote: > On Wed, Apr 25 2007, Jens Axboe wrote: > > On Wed, Apr 25 2007, Alan D. Brunelle wrote: > > > Hi Jens - > > > > > > The attached patch speeds it up even more - I'm finding a >9% reduction > > > in %system with no loss in IO performance. This just sets the cached > > > element when the first is looked for. > > > > Interesting, good thinking. It should not change the IO pattern, as the > > end result should be the same. Thanks Alan, will commit! > > > > I'll give elevator.c the same treatment, should be even more beneficial. > > Stay tuned for a test patch. > > Something like this, totally untested (it compiles). I initially wanted > to fold the cfq addon into the elevator.h provided implementation, but > that requires more extensive changes. Given how little code it is, I > think I'll keep them seperate. Booted, seems to work fine for me. In a null ended IO test, I get about a 1-2% speedup for a single queue of depth 64 using libaio. So it's definitely worth it, will commit. -- 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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