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

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Message-ID: <20070804165604.GA2310@elte.hu>
Date:	Sat, 4 Aug 2007 18:56:04 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Morton <akpm@...ux-foundation.org>
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, 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


* Andrew Morton <akpm@...ux-foundation.org> wrote:

> > yeah, it's really ugly. But otherwise i've got no real complaint 
> > about ext3 - with the obligatory qualification that 
> > "noatime,nodiratime" in /etc/fstab is a must. This speeds up things 
> > very visibly - especially when lots of files are accessed. It's kind 
> > of weird that every Linux desktop and server is hurt by a noticeable 
> > IO performance slowdown due to the constant atime updates,
> 
> Not just more IO: it will cause great gobs of blockdev pagecache to 
> remain in memory, too.

i tried to convince distro folks about it ... but there's fear, 
uncertainty and doubt about touching /etc/fstab and i suspect no major 
distro will do it until another does it - which is a catch-22 :-/ So i 
guess we should add a kernel config option that allows the kernel rpm 
maker to just disable atime by default. (re-enableable via boot-line and 
fstab entry too) [That new kernel config option would be disabled by 
default.] That makes it much easier to control and introduce.

	Ingo
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