linux-kernel - Re: Linux 2.6.29

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Message-ID: <20090402121735.GD10642@mit.edu>
Date:	Thu, 2 Apr 2009 08:17:35 -0400
From:	Theodore Tso <tytso@....edu>
To:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Rees <drees76@...il.com>, Jesper Krogh <jesper@...gh.cc>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.29

On Wed, Apr 01, 2009 at 05:03:38PM -0400, Lennart Sorensen wrote:
> On Thu, Mar 26, 2009 at 06:25:19PM -0700, Andrew Morton wrote:
> > The JBD journal is a massive designed-in contention point.  It's why
> > for several years I've been telling anyone who will listen that we need
> > a new fs.  Hopefully our response to all these problems will soon be
> > "did you try btrfs?".
> 
> Oh I look forward to the day when it will be safe to convert my mythtv
> box from ext3 to btrfs.  Current kernels just have too much IO latency
> with ext3 it seems.  Older kernels were more responsive, but probably
> had other places they were less efficient.

Well, ext4 will be an interim solution you can convert to first.  It
will be best with a backup/reformat/restore pass, better if you enable
extents (at least for new files, but then you won't be able to go back
to ext3), but you'll get improvements even if you just mount an ext3
filesystem as ext4.

						- Ted
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