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Subject: Re: Cannot enable DMA on SATA drive (SCSI-libsata, VIA SATA)
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Petr Sebor <petr@scssoft.com>
Cc: Petter =?ISO-8859-1?Q?Sundl=F6f?= <petter.sundlof@findus.dhs.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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Date: Sun, 29 Aug 2004 14:05:07 +0100
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On Sad, 2004-08-28 at 00:45, Petr Sebor wrote:
> just a 'me too' e-mail... I have Master2-FAR mobo, VIA/KT800 chipset.
> IDE disk runs like a charm but SATA disks consume big amount of cpu
> time (which is spent in iowait). The system behaves exactly as with
> old IDE disk and DMA disabled... everything is slow when data is 
> transferred to/from disk.

Make sure you enable the SCSI later, SATA drivers and VIA SATA driver
otherwise you may end up using PIO with the PCI generic IDE driver.