From: Andrei Warkentin Subject: Re: [RFC 4/5] MMC: Adjust unaligned write accesses. Date: Tue, 22 Mar 2011 02:18:42 -0500 Message-ID: References: <201103211527.45726.arnd@arndb.de> <8E9828F3-7533-4DC7-B2D1-EDFBF11BFCFD@whamcloud.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Cc: Arnd Bergmann , "linux-ext4@vger.kernel.org" To: Andreas Dilger Return-path: Received: from exprod5og114.obsmtp.com ([64.18.0.28]:53719 "EHLO exprod5og114.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754880Ab1CVHnZ (ORCPT ); Tue, 22 Mar 2011 03:43:25 -0400 Received: from il93mgrg01.am.mot-mobility.com ([10.176.130.20]) by il93mgrg01.am.mot-mobility.com (8.14.3/8.14.3) with ESMTP id p2M7HDTr015954 for ; Tue, 22 Mar 2011 03:17:14 -0400 (EDT) Received: from mail-wy0-f170.google.com (mail-wy0-f170.google.com [74.125.82.170]) by il93mgrg01.am.mot-mobility.com (8.14.3/8.14.3) with ESMTP id p2M7HCN8015942 (version=TLSv1/SSLv3 cipher=RC4-SHA bits=128 verify=OK) for ; Tue, 22 Mar 2011 03:17:13 -0400 (EDT) Received: by wyb34 with SMTP id 34so8709258wyb.15 for ; Tue, 22 Mar 2011 00:18:42 -0700 (PDT) In-Reply-To: <8E9828F3-7533-4DC7-B2D1-EDFBF11BFCFD@whamcloud.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Mon, Mar 21, 2011 at 6:45 PM, Andreas Dilger wrote: > I was just looking at the test data. I wonder of this slowness might also be due to sync on ext4 using a barrier, and not on ext2/3? Indeed. ext4 mounts by default with barrier=1... I'll collect some comparison data with various tunables. Sorry. A