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

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Message-ID: <20070209201608.0c1695db@localhost.localdomain>
Date:	Fri, 9 Feb 2007 20:16:08 +0000
From:	Alan <alan@...rguk.ukuu.org.uk>
To:	Robert Hancock <hancockr@...w.ca>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Luigi Genoni <genoni@....it>
Subject: Re: [BUG?] ata disk running maximum at DMA33 with 2.6.20 and new
 pata driver, NV CK804 ide controller.

> 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..

Send patches. We also probably want to change speed straight from
UDMAlots to UDMA33 if the cable is CBL_UNK so that we can rapidly recover
in the cases where the controller says "I'm crap I don't really know" (eg
ATI and Nvidia without ACPI)
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