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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20120302140038.GD5054@shiny>
Date:	Fri, 2 Mar 2012 09:00:38 -0500
From:	Chris Mason <chris.mason@...cle.com>
To:	Jacek Luczak <difrost.kernel@...il.com>
Cc:	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

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).

-chris

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/