From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762810AbYDNRBW (ORCPT ); Mon, 14 Apr 2008 13:01:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1760464AbYDNRBK (ORCPT ); Mon, 14 Apr 2008 13:01:10 -0400 Received: from outpipe-village-512-1.bc.nu ([81.2.110.250]:34610 "EHLO lxorguk.ukuu.org.uk" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1755730AbYDNRBJ (ORCPT ); Mon, 14 Apr 2008 13:01:09 -0400 Date: Mon, 14 Apr 2008 17:56:36 +0100 From: Alan Cox To: Joerg.Schilling@fokus.fraunhofer.de (Joerg Schilling) Cc: htejun@gmail.com, linux-kernel@vger.kernel.org Subject: Re: Again... DMA speed too slow Message-ID: <20080414175636.4ea815dc@core> In-Reply-To: <48038c3e.P3RWjRNXsDrhjIX7%Joerg.Schilling@fokus.fraunhofer.de> References: <48038c3e.P3RWjRNXsDrhjIX7%Joerg.Schilling@fokus.fraunhofer.de> X-Mailer: Claws Mail 3.3.1 (GTK+ 2.12.5; x86_64-redhat-linux-gnu) Organization: Red Hat UK Cyf., Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, Y Deyrnas Gyfunol. Cofrestrwyd yng Nghymru a Lloegr o'r rhif cofrestru 3798903 Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 14 Apr 2008 18:54:22 +0200 Joerg.Schilling@fokus.fraunhofer.de (Joerg Schilling) wrote: > >Which controller are you on? I bet the recording itself will work fine > >on 48x. It's probably that READ/WRITE BUFFERs are executed using PIO > >for compatibility reasons. > > If this happens inside Linux, Linux should be changed... The cases Linux falls back to PIO are the cases where the hardware isn't up to it, or reliably handling some DMA commands. Lots of that about in the PC world. > 2.01.01a38 is the latest. Install cdrecord suid root Remarkably brave ;)