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

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Message-ID: <20070804225121.5c7b66e0@the-village.bc.nu>
Date:	Sat, 4 Aug 2007 22:51:21 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	J??rn Engel <joern@...fs.org>, Jeff Garzik <jeff@...zik.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, linux-mm@...ck.org,
	Linux Kernel Mailing List <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, david@...g.hm
Subject: Re: [PATCH 00/23] per device dirty throttling -v8

> i cannot over-emphasise how much of a deal it is in practice. Atime 
> updates are by far the biggest IO performance deficiency that Linux has 
> today. Getting rid of atime updates would give us more everyday Linux 
> performance than all the pagecache speedups of the past 10 years, 
> _combined_.
> 
> it's also perhaps the most stupid Unix design idea of all times. Unix is 
> really nice and well done, but think about this a bit:

Think about the user for a moment instead. 

Do things right. The job of the kernel is not to "correct" for
distribution policy decisions. The distributions need to change policy.
You do that by showing the distributions the numbers. 

With a Red Hat on if we can move from /dev/hda to /dev/sda in FC7 then we
can move from atime to noatime by default on FC8 with appropriate release
note warnings and having a couple of betas to find out what other than
mutt goes boom.
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