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Message-ID: <20080729091650.0ddca3d8@bree.surriel.com> Date: Tue, 29 Jul 2008 09:16:50 -0400 From: Rik van Riel <riel@...hat.com> To: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> Cc: kosaki.motohiro@...fujitsu.com, linux-kernel@...r.kernel.org, linux-mm@...ck.org, akpm@...ux-foundation.org Subject: Re: PERF: performance tests with the split LRU VM in -mm On Tue, 29 Jul 2008 22:04:16 +0900 KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote: > > TEST 1: dd if=/dev/sda of=/dev/null bs=1M > > > > kernel speed swap used > > > > 2.6.26 111MB/s 500kB > > -mm 110MB/s 59MB (ouch, system noticably slower) > > noforce 111MB/s 128kB > > stream 108MB/s 0 (slight regression, not sure why yet) > > I tried to reproduce it, my ia64 result was > > kernel speed swap used > 2.6.26-rc8 49.8MB/s 1M > 2.6.26-rc8-mm1 47.6MB/s 168M > -mm with above two patch 50.2MB/s 0 > > > So, I think it isn't regression. Agreed. It looked like it, but once I changed the cpuspeed governor from ondemand to performance, I saw that it had to be an artifact of something else. Getting rid of the swap use from a linear IO is the important part. -- All rights reversed. -- 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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