From: Volker Kuhlmann <list0570@paradise.net.nz>
To: linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: ide-cd turning off DMA when verifying DVD-R
Date: Fri, 13 Jan 2006 21:30:09 +1300 [thread overview]
Message-ID: <20060113083009.GE12338@paradise.net.nz> (raw)
In-Reply-To: <43C72F41.5060207@shaw.ca>
On Fri 13 Jan 2006 17:40:33 NZDT +1300, Robert Hancock wrote:
> I'm thinking the IDE code is too aggressive in assuming that the failure
> is because of a DMA problem and disabling it.. Most likely all that's
> happening is the drive is taking a long time to complete the current
> command.
Yes! Each time when inserting a faulty CD/DVD, or whenever the drive
gives read errors for whatever reason, the kernel decides to turn DMA
off and try again, fail (again) and leave DMA off. And this after having
successfully used DMA before - so it's not that the device is
DMA-incapable.
Volker
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Volker Kuhlmann is possibly list0570 with the domain in header
http://volker.dnsalias.net/ Please do not CC list postings to me.
next prev parent reply other threads:[~2006-01-13 8:30 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <5ujmU-1UQ-665@gated-at.bofh.it>
[not found] ` <5uoqr-Qq-7@gated-at.bofh.it>
2006-01-13 4:40 ` Robert Hancock
2006-01-13 8:30 ` Volker Kuhlmann [this message]
2006-01-13 9:19 ` Bartlomiej Zolnierkiewicz
2006-01-13 13:03 ` Ondrej Zary
[not found] ` <58cb370e0601130121s2f6c0a26jda00ff64df197342@mail.gmail.com>
[not found] ` <20060113093818.GA22984@sci.fi>
[not found] ` <58cb370e0601130149g32323b4axbf0ac55f83ac9148@mail.gmail.com>
[not found] ` <20060113112510.GA23264@sci.fi>
2006-01-13 13:33 ` Fwd: " Bartlomiej Zolnierkiewicz
2006-01-13 14:24 ` Alan Cox
[not found] ` <20060113140618.GB12360@tigershaunt.com>
2006-01-13 14:16 ` Bartlomiej Zolnierkiewicz
2006-01-12 21:35 Ondrej Zary
2006-01-13 4:04 ` Ville Syrjälä
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