From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Tue, 7 Oct 2008 13:17:19 -0700 From: Andrew Morton Subject: Re: split-lru performance mesurement part2 Message-Id: <20081007131719.8bb24698.akpm@linux-foundation.org> In-Reply-To: <20081007231851.3B88.KOSAKI.MOTOHIRO@jp.fujitsu.com> References: <20081003153810.5dd0a33e@bree.surriel.com> <20081004232549.CE53.KOSAKI.MOTOHIRO@jp.fujitsu.com> <20081007231851.3B88.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: riel@redhat.com, Lee.Schermerhorn@hp.com, a.p.zijlstra@chello.nl, torvalds@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, trond.myklebust@fys.uio.no, dlezcano@fr.ibm.com, penberg@cs.helsinki.fi, neilb@suse.de, davem@davemloft.net List-ID: On Tue, 7 Oct 2008 23:26:54 +0900 (JST) KOSAKI Motohiro wrote: > Hi > > > yup, > > I know many people want to other benchmark result too. > > I'll try to mesure other bench at next week. > > I ran another benchmark today. > I choice dbench because dbench is one of most famous and real workload like i/o benchmark. > > > % dbench client.txt 4000 > > mainline: Throughput 13.4231 MB/sec 4000 clients 4000 procs max_latency=1421988.159 ms > mmotm(*): Throughput 7.0354 MB/sec 4000 clients 4000 procs max_latency=2369213.380 ms > > (*) mmotm 2/Oct + Hugh's recently slub fix > > > Wow! > mmotm is slower than mainline largely (about half performance). > > Therefore, I mesured it on "mainline + split-lru(only)" build. > > > mainline + split-lru(only): Throughput 14.4062 MB/sec 4000 clients 4000 procs max_latency=1152231.896 ms > > > OK! > split-lru outperform mainline from viewpoint of both throughput and latency :) > > > > However, I don't understand why this regression happend. erk. dbench is pretty chaotic and it could be that a good change causes dbench to get worse. That's happened plenty of times in the past. > Do you have any suggestion? One of these: vmscan-give-referenced-active-and-unmapped-pages-a-second-trip-around-the-lru.patch vm-dont-run-touch_buffer-during-buffercache-lookups.patch perhaps? -- 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