From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: karim@opersys.com, Jens Axboe <axboe@suse.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: ide-cd vs. DMA
Date: Thu, 26 May 2005 15:29:09 +0100 [thread overview]
Message-ID: <1117117746.5744.152.camel@localhost.localdomain> (raw)
In-Reply-To: <1116905090.4992.7.camel@gaston>
On Maw, 2005-05-24 at 04:24, Benjamin Herrenschmidt wrote:
> Well, not sure what's wrong here, but ATAPI errors shouldn't normally
> result in stopping DMA. We may want to just blacklist your drive rather
> than having this stupid fallback. In this case, I suspect it's
> CSS/region issue with a DVD.
The fallback should only be triggering on a DMA CRC error. Turning DMA
off or using ide-scsi works (as generally does using the -ac kernel
tree) because that handles partial completions correctly while readahead
caused errors break the base ide-cd driver badly.
I would suggest avoiding the ide-cd driver in the base kernel for most
purposes, at least until that bug and the "rmmod cache flush" bug are
fixed.
Alan
next prev parent reply other threads:[~2005-05-26 14:31 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-23 23:42 ide-cd vs. DMA Benjamin Herrenschmidt
2005-05-24 3:27 ` Karim Yaghmour
2005-05-24 3:24 ` Benjamin Herrenschmidt
2005-05-24 3:59 ` Karim Yaghmour
2005-05-24 4:03 ` Benjamin Herrenschmidt
2005-05-25 1:31 ` Kurt Wall
2005-05-25 16:12 ` Lennart Sorensen
2005-05-26 14:29 ` Alan Cox [this message]
-- strict thread matches above, loose matches on Subject: below --
2005-05-24 4:26 Chad Kitching
2005-05-24 4:42 ` Benjamin Herrenschmidt
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