From owner-freebsd-current Mon May 18 12:48:17 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id MAA13759 for freebsd-current-outgoing; Mon, 18 May 1998 12:48:17 -0700 (PDT) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from sos.freebsd.dk ([212.242.40.180]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id MAA13750 for ; Mon, 18 May 1998 12:48:13 -0700 (PDT) (envelope-from sos@sos.freebsd.dk) Received: (from sos@localhost) by sos.freebsd.dk (8.8.8/8.8.8) id VAA00325; Mon, 18 May 1998 21:46:46 +0200 (CEST) (envelope-from sos) Message-Id: <199805181946.VAA00325@sos.freebsd.dk> Subject: Re: ATAPI CDDA Extraction under FreeBSD In-Reply-To: <199805181521.RAA07351@labinfo.iet.unipi.it> from Luigi Rizzo at "May 18, 98 05:21:45 pm" To: luigi@labinfo.iet.unipi.it (Luigi Rizzo) Date: Mon, 18 May 1998 21:46:45 +0200 (CEST) Cc: hasty@rah.star-gate.com, regnauld@deepo.prosa.dk, current@FreeBSD.ORG From: Søren Schmidt Reply-to: sos@FreeBSD.ORG X-Mailer: ELM [version 2.4ME+ PL38 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG In reply to Luigi Rizzo who wrote: > > Perhaps, it would be an interesting exercise to use dma to read audio > > tracks on a IDE cdrom. > > i first want to see proper timeout handling on the IDE bus > (and i don't see anyone else going to implement it, so ...) I'm looking at it, I need it for the CDR/RW support too, the problem is that there is no good way to awake a hung ATAPI device, other that flicking the switch :( When I'm done wcd.c will look very different from todays model... > This said, there was probably someone who backported the IDE-DMA > stuff to 2.2.X, but i also saw some comments on its little gain in > performance, and maybe some stability problems ?, that did not > encourage me to test them. You wont gain much performance in disk accesss speed, but you gain alot by freeing the CPU during the transfers... -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Søren Schmidt (sos@FreeBSD.org) FreeBSD Core Team Even more code to hack -- will it ever end .. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message