From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262012AbVAJAKl (ORCPT ); Sun, 9 Jan 2005 19:10:41 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262014AbVAJAKk (ORCPT ); Sun, 9 Jan 2005 19:10:40 -0500 Received: from clock-tower.bc.nu ([81.2.110.250]:5833 "EHLO localhost.localdomain") by vger.kernel.org with ESMTP id S262012AbVAJAII (ORCPT ); Sun, 9 Jan 2005 19:08:08 -0500 Subject: Re: PROBLEM: ide-cd in 2.6.8-2.6.10 and 2.4.26-2.4.28 high cpu use with dma From: Alan Cox To: Hikaru1@verizon.net Cc: axboe@suse.de, Linux Kernel Mailing List In-Reply-To: <20050109123028.GA12753@roll> References: <20050109105201.GB12497@roll> <20050109105418.GD12497@roll> <20050109123028.GA12753@roll> Content-Type: text/plain Content-Transfer-Encoding: 7bit Message-Id: <1105278277.12004.32.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 (1.4.6-2) Date: Sun, 09 Jan 2005 23:01:22 +0000 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sul, 2005-01-09 at 12:30, Hikaru1@verizon.net wrote: > A minor mistake. I forgot to state explicitly that the problem only appears > with writing audio cds. Writing data cds does not cause problems. It sets the required alignment of buffers for DMA. The 2.6.10 code is correct, the question is who is feeding unaligned buffers to the driver layer - the kernel or the SG layer. Which burning interface are you using - /dev/sg (ie dev=1,0,0) or /dev/hd* (dev=/dev/hdc etc)