linux-kernel - Re: Linux 2.6.29

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Date:	Thu, 2 Apr 2009 03:00:44 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>,
	torvalds@...ux-foundation.org, tytso@....edu, drees76@...il.com,
	jesper@...gh.cc, linux-kernel@...r.kernel.org
Subject: Re: Linux 2.6.29


* Andrew Morton <akpm@...ux-foundation.org> wrote:

> 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'.

I'll test this (and the other suggestions) once i'm out of the merge 
window.

> Or with linux-2.5.60 :(

I probably wont test that though ;-)

Going back to v2.6.14 to do pre-mutex-merge performance tests was 
already quite a challenge on modern hardware.

	Ingo
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