From: Daniel J Blueman <daniel.blueman@gmail.com>
To: Bernhard Schmidt <berni@birkenwald.de>
Cc: Chris Mason <chris.mason@oracle.com>,
linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: abysmal performance
Date: Tue, 3 May 2011 22:54:46 +0800 [thread overview]
Message-ID: <BANLkTi=rOx2RT5MZxWzdrA1dmEfS7dsEEg@mail.gmail.com> (raw)
In-Reply-To: <4DBFE75C.2000104@birkenwald.de>
On 3 May 2011 19:30, Bernhard Schmidt <berni@birkenwald.de> wrote:
[]
>> The file the defrag ioctl works is that it schedules things for defrag
>> but doesn't force out the IO immediately unless you use -f.
>>
>> So, to test the result of the defrag, you need to either wait a bit or
>> run sync.
>
> Did so, no change. See my reply to cwillu for the data.
Can you try with the compression option enabled? Eg:
# filefrag foo.dat
foo.dat: 11 extents found
# find . -xdev -type f -print0 | xargs -0 btrfs filesystem defragment -c
# filefrag foo.dat
foo.dat: 1 extent found
Seems to work fine on 2.6.39-rc5; I mounted with '-o
compress,clear_cache' though.
Daniel
--
Daniel J Blueman
next prev parent reply other threads:[~2011-05-03 14:54 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-29 14:46 abysmal performance John Wyzer
2011-04-29 15:01 ` Chris Mason
2011-04-30 17:33 ` Mitch Harder
2011-04-30 20:40 ` John Wyzer
2011-04-30 22:16 ` Mitch Harder
2011-04-30 22:33 ` John Wyzer
2011-05-03 11:05 ` Chris Mason
2011-05-03 11:06 ` Chris Mason
2011-04-30 23:55 ` Peter Stuge
2011-05-03 10:33 ` Bernhard Schmidt
2011-05-03 11:00 ` cwillu
2011-05-03 11:26 ` Bernhard Schmidt
2011-05-03 11:08 ` Chris Mason
2011-05-03 11:30 ` Bernhard Schmidt
2011-05-03 11:36 ` Chris Mason
2011-05-03 11:43 ` Bernhard Schmidt
2011-05-03 12:52 ` Chris Mason
2011-05-03 13:03 ` Bernhard Schmidt
2011-05-03 13:41 ` Mitch Harder
2011-05-03 14:41 ` Daniel J Blueman
2011-05-03 15:42 ` Mitch Harder
2011-05-03 16:51 ` Chris Mason
2011-05-03 14:54 ` Daniel J Blueman [this message]
2011-05-03 15:10 ` Bernhard Schmidt
[not found] ` <1304100271-sup-4177@localhost>
[not found] ` <1304100862-sup-1493@think>
[not found] ` <1304107977-sup-3815@localhost>
[not found] ` <1304110058-sup-7292@think>
[not found] ` <1304146193-sup-2200@localhost>
2011-04-30 20:51 ` John Wyzer
-- strict thread matches above, loose matches on Subject: below --
2011-06-20 21:51 Abysmal Performance Henning Rohlfs
2011-06-21 0:12 ` Josef Bacik
2011-06-21 7:10 ` Henning Rohlfs
2011-06-21 8:00 ` Sander
2011-06-21 9:26 ` Henning Rohlfs
2011-06-21 15:18 ` Josef Bacik
2011-06-21 16:55 ` Henning Rohlfs
2011-06-21 15:24 ` Calvin Walton
2011-06-22 14:15 ` Henning Rohlfs
2011-06-22 15:39 ` Josef Bacik
2011-06-22 15:57 ` Calvin Walton
2011-06-22 15:58 ` Josef Bacik
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