Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756073AbYHUF43 (ORCPT ); Thu, 21 Aug 2008 01:56:29 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753332AbYHUF4Q (ORCPT ); Thu, 21 Aug 2008 01:56:16 -0400 Received: from [93.163.65.50] ([93.163.65.50]:6459 "EHLO kernel.dk" rhost-flags-FAIL-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1753030AbYHUF4P (ORCPT ); Thu, 21 Aug 2008 01:56:15 -0400 X-Greylist: delayed 1807 seconds by postgrey-1.27 at vger.kernel.org; Thu, 21 Aug 2008 01:56:15 EDT Date: Thu, 21 Aug 2008 07:26:05 +0200 From: Jens Axboe To: Eric Sandeen Cc: Milan Broz , Linux Kernel Mailing List , linux-fsdevel , Ric Wheeler , "MASON,CHRISTOPHER" Subject: Re: Mount ext3 with barrier=1 doesn't send real barrier bio? Message-ID: <20080821052604.GM20055@kernel.dk> References: <48A5F5C6.2090204@redhat.com> <48ACAADD.2010104@sandeen.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <48ACAADD.2010104@sandeen.net> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1017 Lines: 26 On Wed, Aug 20 2008, Eric Sandeen wrote: > Milan Broz wrote: > > Hi, > > > > I run some barrier tests over device-mapper (which currently doesn't > > support barrier bio at all) and even if I set barrier=1 in ext3 mount, > > there is never any bio with barrier flag... (in 2.6.27-rc) > > > > How is the barrier=1 flag supposed to work in ext3 (JBD) now? > > Milan, you're right. Ric saw this same strange behavior when doing some > benchmarking with and without barriers; Chris noticed the change in > submit_bh; I was about to write up a similar patch to what you've sent > already. Jens, does Milan's fix look good to you? Yep looks good, thanks a lot Milan! I'll send in the patch, unless I'm badly mistaken we need it for 2.6.26-stable as well. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/