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Date: Wed, 4 Sep 2002 10:55:37 -0400
From: Benjamin LaHaise <bcrl@redhat.com>
To: "Joseph N. Hall" <joseph@5sigma.com>
Cc: Matthew Dharm <mdharm-kernel@one-eyed-alien.net>,
       linux-kernel@vger.kernel.org
Subject: Re: IDE-DVD problems [excuse former idiotic topic]
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Have you tried commenting out the hdparm commands in the initscripts and 
booted with a kernel that enables DMA (instead of using hdparm -d1)?

		-ben

On Tue, Sep 03, 2002 at 11:00:00PM -0700, Joseph N. Hall wrote:
> Yes, DMA makes the drive completely non functional and eventually
> hangs the machine after some amount of attempted use.  This is
> regardless of when DMA is enabled, whether via the standard
> RedHat "harddiskn" mechanism or manually with hdparm.
> 
>   -joseph
> 
> On Tue, 3 Sep 2002 22:37:57 -0700, Matthew Dharm <mdharm-kernel@one-eyed-alien.net> wrote:
> > 
> > Have you tried enabling DMA on the drive?
> > 
> > Matt
> > 
> > On Tue, Sep 03, 2002 at 06:45:00PM -0700, Joseph N. Hall wrote:
> > > Dear Kernel Folks,
> > >
> > > I am trying to determine the cause of the poor performance of a
> > > an IDE DVD device on my new machine.  I have an IDE Panasonic DF-210-type
> > > DVD-RAM/R/ROM in a new machine with Soyo KT333 motherboard.  It
> > > transfers data slowly (below DVD speed), consumes large amounts of
> > > system time, and slows down the user interface and even system
> > > clock (which can run as slow as 1/4 speed while the drive is
> > > going).
> > >
> > > The interrupt ERR count below seems to be mostly related to use
> > > of the DVD drive.
> > >
> > > Maybe it's something simple.  If not, I'll be glad to do further
> > > work to help diagnose the problem.

-- 
"You will be reincarnated as a toad; and you will be much happier."
-
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