linux-kernel - Re: Linux 2.6.29

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Message-Id: <20090401143622.b1885643.akpm@linux-foundation.org>
Date:	Wed, 1 Apr 2009 14:36:22 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	lsorense@...lub.uwaterloo.ca (Lennart Sorensen)
Cc:	torvalds@...ux-foundation.org, tytso@....edu, drees76@...il.com,
	jesper@...gh.cc, linux-kernel@...r.kernel.org
Subject: Re: Linux 2.6.29

On Wed, 1 Apr 2009 17:03:38 -0400
lsorense@...lub.uwaterloo.ca (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.

Back in 2002ish I did a *lot* of work on IO latency, reads-vs-writes,
etc, etc (but not fsync - for practical purposes it's unfixable on
ext3-ordered)

Performance was pretty good.  From some of the descriptions I'm seeing
get tossed around lately, I suspect that it has regressed.

It would be useful/interesting if people were to rerun some of these
tests with `echo anticipatory > /sys/block/sda/queue/scheduler'.

Or with linux-2.5.60 :(

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