linux-kernel - Re: Again... DMA speed too slow

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Message-ID: <20080414175636.4ea815dc@core>
Date:	Mon, 14 Apr 2008 17:56:36 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Joerg.Schilling@...us.fraunhofer.de (Joerg Schilling)
Cc:	htejun@...il.com, linux-kernel@...r.kernel.org
Subject: Re: Again... DMA speed too slow

On Mon, 14 Apr 2008 18:54:22 +0200
Joerg.Schilling@...us.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 ;)
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