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

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Message-ID: <20070804163733.GA31001@elte.hu>
Date:	Sat, 4 Aug 2007 18:37:33 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	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

* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> > hm, it turns out that it's due to vim doing an occasional fsync not 
> > only on writeout, but during normal use too. "set nofsync" in the 
> > .vimrc solves this problem.
> 
> Yes, that's independent. The fact is, ext3 *sucks* at fsync. I hate 
> hate hate it. It's totally unusable, imnsho.

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, while there's just two real users of it: 
tmpwatch [which can be configured to use ctime so it's not a big issue] 
and some backup tools. (Ok, and mail-notify too i guess.) Out of tens of 
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%)

	Ingo
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