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