linux-kernel - Re: sata_via: write errors on PATA drive connected to VT6421

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Date:	Tue, 21 Aug 2007 19:09:30 +0200
From:	Ondrej Zary <linux@...nbow-software.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	jgarzik@...ox.com, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: sata_via: write errors on PATA drive connected to VT6421

On Tuesday 21 August 2007 14:27:31 Alan Cox wrote:
> > The transfer mode decreases from UDMA/100 to UDMA/66 and then UDMA/33 but
> > it doesn't help at all. The drive itself is fine, the problems also
> > appear with
>
> Does it settle at UDMA33 or keep going down lower ?

It does not go below UDMA33. 
dd if=/dev/zero of=some.file bs=131072 count=1024 takes 526 seconds (amazing 
transfer rate 255KB/s) with system being unresponsive most of the time.

Commenting out the UDMA support in sata_via.c (.udma_mask and .set_dmamode for 
PATA port) causes the driver to run in PIO4 mode which seems to work without 
errors but slowly (3MB/s with 100% CPU load).

-- 
Ondrej Zary
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