linux-kernel - split-lru performance mesurement part2

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Message-Id: <20081007231851.3B88.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Tue,  7 Oct 2008 23:26:54 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	netdev@...r.kernel.org, trond.myklebust@....uio.no,
	Daniel Lezcano <dlezcano@...ibm.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Neil Brown <neilb@...e.de>, David Miller <davem@...emloft.net>
Subject: split-lru performance mesurement part2

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.
Do you have any suggestion?




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