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From: Robert Hancock <>
To: Alan <>,
	linux-kernel <>
Cc: Luigi Genoni <>
Subject: Re: [BUG?] ata disk running maximum at DMA33 with 2.6.20 and new pata driver, NV CK804 ide controller.
Date: Wed, 07 Feb 2007 22:36:58 -0600	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Alan wrote:
> On Wed, 7 Feb 2007 01:19:36 +0100
> Luigi Genoni <> 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 

Robert Hancock      Saskatoon, SK, Canada
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       reply	other threads:[~2007-02-08  4:38 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <>
     [not found] ` <>
2007-02-08  4:36   ` Robert Hancock [this message]
2007-02-08 12:33     ` l.genoni
2007-02-09 20:16     ` Alan
2007-02-07  0:19 Luigi Genoni
2007-02-07 10:03 ` venom
2007-02-07 12:20 ` Alan
2007-02-07 12:44   ` l.genoni
  -- strict thread matches above, loose matches on Subject: below --
2007-02-06 23:48 l.genoni

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