From: Chris Mason Subject: Re: getdents - ext4 vs btrfs performance Date: Fri, 2 Mar 2012 09:00:38 -0500 Message-ID: <20120302140038.GD5054@shiny> References: <20120301143859.GX5054@shiny> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Theodore Tso , linux-ext4@vger.kernel.org, linux-fsdevel , LKML , linux-btrfs@vger.kernel.org To: Jacek Luczak Return-path: Received: from acsinet15.oracle.com ([141.146.126.227]:21491 "EHLO acsinet15.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755275Ab2CBOAo (ORCPT ); Fri, 2 Mar 2012 09:00:44 -0500 Content-Disposition: inline In-Reply-To: Sender: linux-ext4-owner@vger.kernel.org List-ID: 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