linux-kernel - Re: ext3 IO latency measurements (was: Linux 2.6.29)

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Message-ID: <alpine.LFD.2.00.0903261015050.3032@localhost.localdomain>
Date:	Thu, 26 Mar 2009 10:16:25 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Theodore Tso <tytso@....edu>
cc:	Ingo Molnar <mingo@...e.hu>, Jan Kara <jack@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <npiggin@...e.de>,
	Jens Axboe <jens.axboe@...cle.com>,
	David Rees <drees76@...il.com>, Jesper Krogh <jesper@...gh.cc>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Roland McGrath <roland@...hat.com>
Subject: Re: ext3 IO latency measurements (was: Linux 2.6.29)



On Thu, 26 Mar 2009, Theodore Tso wrote:
> 
> You can, actually, but it requires hacking /boot/grub/menu.list.  The
> boot command option "rootflags=noatime" should do it, if their initrd
> scripts are at all sane (and they honor rootfstype, so they probably
> do also honor rootflags).

Not when I tried it. It just causes the initrd to be mounted noatime, and 
then the real root filesystem gets mounted atime again.

Maybe I screwed up. But I don't think so.

> The question is whether we can make Fedora 11 and OpenSUSE do the
> right thing now that this has become a highly visible discussion.  I'm
> actually fairly optimistic on this front.  (Maybe some distro folks
> will care to chime in on whether upcoming releases of F11 and OpenSuSE
> can be changed to DTRT?)

And what's the argument for not doing it in the kernel?

The fact is, "atime" by default is just wrong.

			Linus
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