From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761838AbYESNkD (ORCPT ); Mon, 19 May 2008 09:40:03 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1764028AbYESN3V (ORCPT ); Mon, 19 May 2008 09:29:21 -0400 Received: from rgminet01.oracle.com ([148.87.113.118]:44291 "EHLO rgminet01.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1764015AbYESN3S (ORCPT ); Mon, 19 May 2008 09:29:18 -0400 From: Chris Mason To: Andi Kleen Subject: Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes Date: Mon, 19 May 2008 09:26:41 -0400 User-Agent: KMail/1.9.9 Cc: Andrew Morton , Eric Sandeen , linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, jamie@shareable.org References: <482DDA56.6000301@redhat.com> <20080516130545.845a3be9.akpm@linux-foundation.org> <87ej7zcrqv.fsf@basil.nowhere.org> In-Reply-To: <87ej7zcrqv.fsf@basil.nowhere.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200805190926.41970.chris.mason@oracle.com> X-Brightmail-Tracker: AAAAAQAAAAI= X-Brightmail-Tracker: AAAAAQAAAAI= X-Whitelist: TRUE X-Whitelist: TRUE Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sunday 18 May 2008, Andi Kleen wrote: > Andrew Morton writes: > > On Fri, 16 May 2008 14:02:46 -0500 > > > > Eric Sandeen wrote: > >> A collection of patches to make ext3 & 4 use barriers by > >> default, and to call blkdev_issue_flush on fsync if they > >> are enabled. > > > > Last time this came up lots of workloads slowed down by 30% so I > > dropped the patches in horror. > > Didn't ext4 have some new checksum trick to avoid them? I didn't think checksumming avoided barriers completely. Just the barrier before the commit block, not the barrier after. -chris