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

[l . genoni]

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@xxxxxxx>
> To: Alan <alan@xxxxxxxxxxxxxxxxxxx>,
>     linux-kernel <linux-kernel@xxxxxxxxxxxxxxx>
> Cc: Luigi Genoni <genoni@xxxxxx>
> 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@xxxxxx>
>
> Alan wrote:
> > On Wed, 7 Feb 2007 01:19:36 +0100
> > Luigi Genoni <genoni@xxxxxx> 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@xxxxxxxxxxxxx
> Home Page: http://www.roberthancock.com/
>
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