linux-kernel - Re: [PATCH 00/23] per device dirty throttling -v8

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Message-ID: <20070804171724.GA4740@elte.hu>
Date:	Sat, 4 Aug 2007 19:17:24 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Diego Calleja <diegocg@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, miklos@...redi.hu,
	akpm@...ux-foundation.org, neilb@...e.de, dgc@....com,
	tomoki.sekiyama.qu@...achi.com, nikita@...sterfs.com,
	trond.myklebust@....uio.no, yingchao.zhou@...il.com,
	richard@....demon.co.uk
Subject: Re: [PATCH 00/23] per device dirty throttling -v8


* Diego Calleja <diegocg@...il.com> wrote:

> El Sat, 4 Aug 2007 18:37:33 +0200, Ingo Molnar <mingo@...e.hu> escribió:
> 
> > thousands of applications. So for most file workloads we give 
> > Windows a 20%-30% performance edge, for almost nothing. (for 
> > RAM-starved kernel builds the performance difference between atime 
> > and noatime+nodiratime setups is more on the order of 40%)
> 
> Just curious - do you have numbers with relatime?

nope. Stupid question, i just tried it and got this:

 EXT3-fs: Unrecognized mount option "relatime" or missing value

i've got util-linux-2.13-0.46.fc6 and 2.6.22 on that box, shouldnt that 
be recent enough? As far as i can see it from the kernel-side code, this 
works on the general VFS level and hence should be supported by ext3 
already.

even relatime means one extra write IO after a file has been created, 
but at least for read-mostly files it avoids the continuous atime 
update.

	Ingo
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