From: Mingming Subject: Re: Ordered data mode vs. writeback mode Date: Tue, 17 Jun 2008 11:42:07 -0700 Message-ID: <1213728127.27507.62.camel@BVR-FS.beaverton.ibm.com> References: <3.0.6.32.20080616225930.01b86a60@pop.west.cox.net> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: "linux-ext4@vger.kernel.org" To: Gary Hawco Return-path: Received: from e36.co.us.ibm.com ([32.97.110.154]:50766 "EHLO e36.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756133AbYFQSlq (ORCPT ); Tue, 17 Jun 2008 14:41:46 -0400 Received: from d03relay02.boulder.ibm.com (d03relay02.boulder.ibm.com [9.17.195.227]) by e36.co.us.ibm.com (8.13.8/8.13.8) with ESMTP id m5HIfiMM013477 for ; Tue, 17 Jun 2008 14:41:44 -0400 Received: from d03av03.boulder.ibm.com (d03av03.boulder.ibm.com [9.17.195.169]) by d03relay02.boulder.ibm.com (8.13.8/8.13.8/NCO v9.0) with ESMTP id m5HIfaLR117314 for ; Tue, 17 Jun 2008 12:41:38 -0600 Received: from d03av03.boulder.ibm.com (loopback [127.0.0.1]) by d03av03.boulder.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id m5HIfZiN016771 for ; Tue, 17 Jun 2008 12:41:35 -0600 In-Reply-To: <3.0.6.32.20080616225930.01b86a60@pop.west.cox.net> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Mon, 2008-06-16 at 22:59 +0000, Gary Hawco wrote: > Noticed that the newest set of patches in ext4-patch-queue has ordered data > mode as the default mode again. Tune2fs is now able to switch modes again. > > What is the preferred mode for a home desktop system with ext4? Is > writeback still the fastest, but ordered data has more data integrity? And > does delalloc only work when writeback is enabled? The update patch queue has patch to support delalloc on new ordered mode. There seems an issue, Aneesh is debugging it now. > And does the commit=XX > seconds still only work with writeback mode, ala ext3, or is it a valid > option with ordered data mode? > Should work for both mode. Mingming