Subject: Re: DVD/CD Read Problem: cdrom_decode_status: status=0x51
	{DriveReady SeekComplete Error}
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Adam Kessel <adam@bostoncoop.net>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
In-Reply-To: <20030713140627.GA761@joehill.bostoncoop.net>
References: <20030713140627.GA761@joehill.bostoncoop.net>
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Date: 13 Jul 2003 15:19:47 +0100
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On Sul, 2003-07-13 at 15:06, Adam Kessel wrote:
> I don't believe this is a userspace issue.  Other OS's are able to deal with
> playing video DVDs by skipping read errors quickly.  There should be some one
> way to tell the kernel not to keep retrying for certain (i.e., non-data)
> CD/DVDs.  I can't see any possible way to do this in application space, though.  

It is mostly a user space issue. A DVD drive takes a couple of seconds
to decide bad things have happened. A way to lower retries is definitely
sensible but thats different.

The unexpected NULL on the 2.5 case points to IDE layer bugs too btw.

Userspace should be using a thread pulling data at least ten or fifteen
seconds ahead of the UI, even with the retries toned down.

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