linux-ext4 - Re: getdents - ext4 vs btrfs performance

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Message-ID: <CADDYkjT8apYQpdZqr1gZKiHbm9xfTaLr=8GEJF0VKF9neHwgOg@mail.gmail.com>
Date:	Fri, 2 Mar 2012 15:16:12 +0100
From:	Jacek Luczak <difrost.kernel@...il.com>
To:	Chris Mason <chris.mason@...cle.com>,
	Jacek Luczak <difrost.kernel@...il.com>,
	Theodore Tso <tytso@....edu>, linux-ext4@...r.kernel.org,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>, linux-btrfs@...r.kernel.org
Subject: Re: getdents - ext4 vs btrfs performance

2012/3/2 Chris Mason <chris.mason@...cle.com>:
> On Fri, Mar 02, 2012 at 11:05:56AM +0100, Jacek Luczak wrote:
>>
>> I've took both on tests. The subject is acp and spd_readdir used with
>> tar, all on ext4:
>> 1) acp: http://91.234.146.107/~difrost/seekwatcher/acp_ext4.png
>> 2) spd_readdir: http://91.234.146.107/~difrost/seekwatcher/tar_ext4_readir.png
>> 3) both: http://91.234.146.107/~difrost/seekwatcher/acp_vs_spd_ext4.png
>>
>> The acp looks much better than spd_readdir but directory copy with
>> spd_readdir decreased to 52m 39sec (30 min less).
>
> Do you have stats on how big these files are, and how fragmented they
> are?  For acp and spd to give us this, I think something has gone wrong
> at writeback time (creating individual fragmented files).

How big? Which files?

-Jacek
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