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

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Date:	Thu, 09 Aug 2007 11:02:38 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Lionel Elie Mamane <lionel@...ane.lu>, Ingo Molnar <mingo@...e.hu>,
	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, yingcha@...p.vs19.net
Subject: Re: [PATCH 00/23] per device dirty throttling -v8

On 08/09/2007 02:25 AM, Lionel Elie Mamane 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 (...). So for most file workloads we give Windows a
>> 20%-30% performance edge, for almost nothing.
> 
> It has been years since I used MS Windows much, but from my memories
> of my these days, I was under the impression that it (at least the NT
> line, the only surviving line these days) also maintained "last
> accessed" times. Except I only ever saw it at "right now" because the
> file explorer ... accesses the file before getting this metadata or
> something like that (when you right-click on a file and ask for its
> properties). It has creation and last modification time, too.
> 

NT maintains atimes by default, at least up to XP. You have to edit the
registry to turn them off, and it is a single global switch -- not per
mountpoint like Unix.

And it makes a huge difference there, too.
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