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

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Message-Id: <20070804095143.b8cc2c78.akpm@linux-foundation.org>
Date:	Sat, 4 Aug 2007 09:51:43 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
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

On Sat, 4 Aug 2007 18:37:33 +0200 Ingo Molnar <mingo@...e.hu> wrote:

> 
> * 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,

Not just more IO: it will cause great gobs of blockdev pagecache to remain
in memory, too.


> 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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