LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
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/


       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   ` 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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=45D63BCE.2080700@shaw.ca \
    --to=hancockr@shaw.ca \
    --cc=alan@lxorguk.ukuu.org.uk \
    --cc=linux-ide@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=ranma+kernel@tdiedrich.de \
    --subject='Re: pata_amd dropping to PIO on resume' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).