From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755486AbYE2Nga (ORCPT ); Thu, 29 May 2008 09:36:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752202AbYE2NgT (ORCPT ); Thu, 29 May 2008 09:36:19 -0400 Received: from sandeen.net ([209.173.210.139]:30019 "EHLO sandeen.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751368AbYE2NgS (ORCPT ); Thu, 29 May 2008 09:36:18 -0400 Message-ID: <483EB151.0@sandeen.net> Date: Thu, 29 May 2008 08:36:17 -0500 From: Eric Sandeen User-Agent: Thunderbird 2.0.0.14 (Macintosh/20080421) MIME-Version: 1.0 To: Andrew Morton CC: linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, jamie@shareable.org Subject: Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes References: <482DDA56.6000301@redhat.com> <20080516130545.845a3be9.akpm@linux-foundation.org> In-Reply-To: <20080516130545.845a3be9.akpm@linux-foundation.org> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Andrew Morton wrote: > 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. > > I just don't think we can quietly go and slow everyone's machines down > by this much. The overhead of journalling is already pretty horrid. > > If we were seeing a significant number of "hey, my disk got wrecked" > reports which attributable to this then yes, perhaps we should change > the default. But I've never seen _any_, although I've seen claims that > others have seen reports. Here's a recent one, just FYI. http://marc.info/?l=ext3-users&m=121205834608161&w=2 -Eric