From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Tue, 29 Jul 2008 09:16:50 -0400 From: Rik van Riel Subject: Re: PERF: performance tests with the split LRU VM in -mm Message-ID: <20080729091650.0ddca3d8@bree.surriel.com> In-Reply-To: <20080729220012.F192.KOSAKI.MOTOHIRO@jp.fujitsu.com> References: <20080724222510.3bbbbedc@bree.surriel.com> <20080729220012.F192.KOSAKI.MOTOHIRO@jp.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: KOSAKI Motohiro Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org List-ID: On Tue, 29 Jul 2008 22:04:16 +0900 KOSAKI Motohiro 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org