Re: [BUG?] ata disk running maximum at DMA33 with 2.6.20 and new pata driver, NV CK804 ide controller.

[l.genoni@oltrelinux.com]

Well, the cable is OK, of course I checked.

On Wed, 7 Feb 2007, Robert Hancock wrote:

> Date: Wed, 07 Feb 2007 22:36:58 -0600
> From: Robert Hancock <hancockr@shaw.ca>
> To: Alan <alan@lxorguk.ukuu.org.uk>,
>     linux-kernel <linux-kernel@vger.kernel.org>
> Cc: Luigi Genoni <genoni@sns.it>
> Subject: Re: [BUG?] ata disk running maximum at DMA33 with 2.6.20 and new pata
>      driver, NV CK804 ide controller.
> Resent-Date: Thu, 08 Feb 2007 05:47:22 +0100
> Resent-From: <l.genoni@sns.it>
>
> Alan wrote:
> > On Wed, 7 Feb 2007 01:19:36 +0100
> > Luigi Genoni <genoni@sns.it> wrote:
> >
> > > Hi,
> > > since upgrading to kernel 2.6.20 my pata disk, using new pata driver, is
> > > initialized maximum  in DMA33 mode (and obviously performances drop 
> > > consequently), as you can see from:
> >
> > Interesting.
> >
> > > Willing to test any patch.
> >
> > Firstly can you see if its consistently the case that booting 2.6.20
> > gives UDMA33 and 2.6.19 UDMA100 over a few reboots. If it is please drop
> > the 2.6.19 drivers/ata/pamd_amd into 2.6.20 and try that.
>
> As an aside to this sort of problem, shouldn't we print some kind of loud 
> message in dmesg when we force a high-UDMA-capable device down to UDMA33 due 
> to a 40-wire cable detection? In the case where it truly is a 40-wire cable 
> the user may want to know that and replace the cable, if it isn't it gives 
> more of a hint of why the drive isn't running at full speed..
>
> --
> Robert Hancock      Saskatoon, SK, Canada
> To email, remove "nospam" from hancockr@nospamshaw.ca
> Home Page: http://www.roberthancock.com/
>
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