linux-kernel - Re: split-lru performance mesurement part2

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Message-ID: <48EBD469.6090409@redhat.com>
Date:	Tue, 07 Oct 2008 17:28:09 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Lee.Schermerhorn@...com, a.p.zijlstra@...llo.nl,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, netdev@...r.kernel.org,
	trond.myklebust@....uio.no, dlezcano@...ibm.com,
	penberg@...helsinki.fi, neilb@...e.de, davem@...emloft.net
Subject: Re: split-lru performance mesurement part2

Andrew Morton wrote:

> 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?

Worth a try, but it could just as well be a CPU scheduler change
that happens to indirectly impact locking :)

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