From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756681Ab2CBOAr (ORCPT ); Fri, 2 Mar 2012 09:00:47 -0500 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 Date: Fri, 2 Mar 2012 09:00:38 -0500 From: Chris Mason To: Jacek Luczak Cc: Theodore Tso , linux-ext4@vger.kernel.org, linux-fsdevel , LKML , linux-btrfs@vger.kernel.org Subject: Re: getdents - ext4 vs btrfs performance Message-ID: <20120302140038.GD5054@shiny> Mail-Followup-To: Chris Mason , Jacek Luczak , Theodore Tso , linux-ext4@vger.kernel.org, linux-fsdevel , LKML , linux-btrfs@vger.kernel.org References: <20120301143859.GX5054@shiny> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) X-Source-IP: ucsinet21.oracle.com [156.151.31.93] X-CT-RefId: str=0001.0A090202.4F50D28A.00A5,ss=1,re=0.000,fgs=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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