From mboxrd@z Thu Jan  1 00:00:00 1970
From: Bernhard Schmidt <berni@birkenwald.de>
Subject: Re: abysmal performance
Date: Tue, 3 May 2011 10:33:25 +0000 (UTC)
Message-ID: <ipolll$2h0$1@dough.gmane.org>
References: <1304088305-sup-3784@localhost> <1304089239-sup-5110@think>
 <BANLkTi=6YHDSmcg5DiHPiL1xWdT1nWobBg@mail.gmail.com>
 <20110430235539.6205.qmail@stuge.se>
To: linux-btrfs@vger.kernel.org
Return-path: <linux-btrfs-owner@vger.kernel.org>
List-ID: <linux-btrfs.vger.kernel.org>

Peter Stuge <peter@stuge.se> wrote:

Hey,

defragging btrfs does not seem to work for me. I have run the filefrag
command over the whole fs and (manually) tried to defrag a few heavily
fragmented files, but I don't get it to work (it still has the same
number of extends and they are horrently uncorrelated)

root@schleppi:~# filefrag
/usr/lib/x86_64-linux-gnu/gcc/x86_64-linux-gnu/4.4/cc1
/usr/lib/x86_64-linux-gnu/gcc/x86_64-linux-gnu/4.4/cc1: 72 extents found
root@schleppi:~# btrfs filesystem defrag
/usr/lib/x86_64-linux-gnu/gcc/x86_64-linux-gnu/4.4/cc1
root@schleppi:~# filefrag
/usr/lib/x86_64-linux-gnu/gcc/x86_64-linux-gnu/4.4/cc1
/usr/lib/x86_64-linux-gnu/gcc/x86_64-linux-gnu/4.4/cc1: 72 extents found

I'm using Ubuntu Natty (2.6.38.4) and tried both btrfs-tools from Natty
(201006xx) and from Debian experimental (git from 20101101). Both show
the same symptoms. I don't think fragmentation is bad on this box (due
to having an SSD), but my system at home is getting dog slow and I'd
like to try that when I come home end of the week.

Best Regards,
Bernhard