Date: Mon, 18 May 1998 21:46:45 +0200 (CEST) From: Søren Schmidt <sos@FreeBSD.ORG> To: luigi@labinfo.iet.unipi.it (Luigi Rizzo) Cc: hasty@rah.star-gate.com, regnauld@deepo.prosa.dk, current@FreeBSD.ORG Subject: Re: ATAPI CDDA Extraction under FreeBSD Message-ID: <199805181946.VAA00325@sos.freebsd.dk> In-Reply-To: <199805181521.RAA07351@labinfo.iet.unipi.it> from Luigi Rizzo at "May 18, 98 05:21:45 pm"
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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
..
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