From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266103AbTLaDyK (ORCPT ); Tue, 30 Dec 2003 22:54:10 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266104AbTLaDyK (ORCPT ); Tue, 30 Dec 2003 22:54:10 -0500 Received: from ms-smtp-01-qfe0.nyroc.rr.com ([24.24.2.55]:6285 "EHLO ms-smtp-01.nyroc.rr.com") by vger.kernel.org with ESMTP id S266103AbTLaDyI (ORCPT ); Tue, 30 Dec 2003 22:54:08 -0500 From: craig duncan MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <16370.18579.203219.50287@nycap.rr.com> Date: Tue, 30 Dec 2003 22:54:59 -0500 To: Jens Axboe Subject: Re: Problem with buffer underruns burning at 8x under 2.6 In-Reply-To: <20031230191712.GQ3086@suse.de> References: <16365.58236.420224.645120@nycap.rr.com> <20031229192639.GI3086@suse.de> <16369.47055.613713.304233@nycap.rr.com> <20031230191712.GQ3086@suse.de> X-Mailer: VM 7.18 under Emacs 21.3.1 CC: linux-kernel@vger.kernel.org Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Jens Axboe writes: > Your problem is that DMA is disabled. I don't know why you say that > hdparm doesn't work for you, how are you running it? I'm assuming that > /dev/cdrom is linked to /dev/hdc (or where is you CDROM located?). You're right... dma is disabled... for _all_ my drives. Some change between booting up in 2.4 vs 2.6. I have no idea why... yet. And hdparm does work fine on /dev/cdrom. I did something stupid (ran /sbin/hdparm as a normal user) which made me think it didn't. Thanks for your help. craig