From: Robert Hancock <hancockr@shaw.ca>
To: Tobias Diedrich <ranma+kernel@tdiedrich.de>,
Linux Kernel ML <linux-kernel@vger.kernel.org>,
linux-ide@vger.kernel.org, Alan <alan@lxorguk.ukuu.org.uk>
Subject: Re: pata_amd dropping to PIO on resume
Date: Fri, 16 Feb 2007 17:18:38 -0600 [thread overview]
Message-ID: <45D63BCE.2080700@shaw.ca> (raw)
In-Reply-To: <fa.q7ZuddHInqn2dVlS+EWjXjPvFC8@ifi.uio.no>
Tobias Diedrich wrote:
> Possibly a known issue:
>
> After resume pata_amd drops from UDMA/33 to PIO on my system.
> Reloading the module puts both attached optical drives (master and
> slave) back to UDMA/33.
>
> AFAICS "simplex DMA is claimed by other device, disabling DMA" seems
> to be causing it to drop to PIO (but only after a suspend/resume
> cycle, not on boot or module load).
>
> Burning a DVD with 6x speed using PIO makes heavy use of burnproof
> and makes the whole system quite sluggish. :)
Yes, the fact that it's going into simplex mode is the problem, it
wasn't in simplex to start with. It looks like pata_amd does an
ata_pci_clear_simplex only for certain chip models, maybe this model
needs it as well?
--
Robert Hancock Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@nospamshaw.ca
Home Page: http://www.roberthancock.com/
next parent reply other threads:[~2007-02-16 23:20 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <fa.q7ZuddHInqn2dVlS+EWjXjPvFC8@ifi.uio.no>
2007-02-16 23:18 ` Robert Hancock [this message]
2007-02-16 23:51 ` pata_amd dropping to PIO on resume Jeff Garzik
2007-02-17 9:49 ` Tobias Diedrich
2007-02-19 22:08 ` Alan
2007-02-20 15:27 ` Jeff Garzik
2007-02-20 16:42 ` Alan
2007-02-16 16:21 Tobias Diedrich
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