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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Date:	Wed, 7 Feb 2007 13:44:16 +0100 (CET)
From:	l.genoni@...relinux.com
To:	Alan <alan@...rguk.ukuu.org.uk>
cc:	linux-ide@...r.kernel.org, jgarzik@...ox.com, htejun@...il.com,
	alan@...-hat.com, linux-kernel@...r.kernel.org
Subject: Re: [BUG?] ata disk running maximum at DMA33 with 2.6.20 and new
 pata driver, NV CK804 ide controller.

I did the test you asked and yes, it is consistently booting at DMA33 with 
2.6.20 and DMA100 with 2.6.19.3 (20 reboots, 10 2.6.20 and 10 2.6.19 in 
sparse order).
I am compiling a 2.6.20 kernel with older pata_amd.c driver and will let 
you know. seeing the diff I do exspect it to compile cleanly.

Luigi


On Wed, 7 Feb 2007, Alan wrote:

> Date: Wed, 7 Feb 2007 12:20:00 +0000
> From: Alan <alan@...rguk.ukuu.org.uk>
> To: Luigi Genoni <genoni@....it>
> Cc: linux-ide@...r.kernel.org, jgarzik@...ox.com, htejun@...il.com,
>     alan@...-hat.com, linux-kernel@...r.kernel.org
> Subject: Re: [BUG?] ata disk running maximum at DMA33 with 2.6.20 and new pata
>      driver, NV CK804 ide controller.
> Resent-Date: Wed, 07 Feb 2007 13:17:42 +0100
> Resent-From: <l.genoni@....it>
> 
> On Wed, 7 Feb 2007 01:19:36 +0100
> Luigi Genoni <genoni@....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.
>
> Thanks
>
> Alan
> -
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