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@xxxxxxxxxxxxxxxxxxx>
To: Luigi Genoni <genoni@xxxxxx>
Cc: linux-ide@xxxxxxxxxxxxxxx, jgarzik@xxxxxxxxx, htejun@xxxxxxxxx,
alan@xxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
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@xxxxxx>
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.
Thanks
Alan
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