From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261851AbUEVTbi (ORCPT ); Sat, 22 May 2004 15:31:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261857AbUEVTbi (ORCPT ); Sat, 22 May 2004 15:31:38 -0400 Received: from cantor.suse.de ([195.135.220.2]:20105 "EHLO Cantor.suse.de") by vger.kernel.org with ESMTP id S261851AbUEVTbg (ORCPT ); Sat, 22 May 2004 15:31:36 -0400 Subject: Re: [PATCH] ext3 barrier bits From: Chris Mason To: Andrew Morton Cc: Jens Axboe , linux-kernel@vger.kernel.org In-Reply-To: <20040522011139.01a7da10.akpm@osdl.org> References: <20040521093207.GA1952@suse.de> <20040521023807.0de63c7a.akpm@osdl.org> <20040521100234.GK1952@suse.de> <20040521235044.6160cccb.akpm@osdl.org> <20040522073540.GO1952@suse.de> <20040522011139.01a7da10.akpm@osdl.org> Content-Type: text/plain Message-Id: <1085254293.9467.5026.camel@watt.suse.com> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 Date: Sat, 22 May 2004 15:31:33 -0400 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 2004-05-22 at 04:11, Andrew Morton wrote: > May as well cc lkml on this. It's to do with the disk write barrier > implementation. > - Does reiserfs support `mount -o remount,barrier=flush'? and "=none"? > Yes...there are no messages to clue the user in, but it does happen. > - How do I test the "oh, barriers aren't working" fallback code in ext3? > Jens suggested mounting with barriers on for scsi, that's what I've been doing. I also did some crash tests on scsi to make sure the io really is happening when barriers fail. -chris