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Subject: RE: IDE DMA with SATA, 2.6 kernels
Date: Thu, 26 May 2005 08:40:08 -0700
Message-ID: <0EF82802ABAA22479BC1CE8E2F60E8C31B4EB9@scl-exch2k3.phoenix.com>
Thread-Topic: IDE DMA with SATA, 2.6 kernels
Thread-Index: AcVhqGOZRF8X8TnoTq2VqZ/zZ8CmEgAYAxOw
From: "Aleksey Gorelov" <Aleksey_Gorelov@Phoenix.com>
To: "Tyler Eaves" <tyler@cg2.org>, <linux-kernel@vger.kernel.org>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1431
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>Disk Setup:
>
>/dev/sda is a 200GB Maxtor SATA drive containing /boot,/, and swap
>/dev/hda is a DVD-ROM/CD-RW driver (IDE)
>/dev/hdc is a 160GB Maxtor IDE drive containing ThatOtherOS(TM)
>
>The SATA drive works superbly, in UDMA133 mode. No complaints there.
>However, it appears that the generic IDE driver grabs the IDE drives
>before the Via driver can get them. This prevents me from using DMA on
>those drivers, so, for instance, ripping CDs is really painful. I can
>rip at about 2x on a good day, versus 40x+ ripping in Exact Audio Copy
>under XP.
>
>You can find the relevant portion of my dmesg (and hdparm) at
>http://cg2.org/dmesg.txt
>
>Any assistance would be very much appreciated.

 Do you have .config handy? Make shure you've got
CONFIG_BLK_DEV_IDEDMA_PCI
enabled there. In most cases you should be able to control DMA with
generic
driver.
 Another thing to double check is that DMA is on in your BIOS.

Aleks. 
>
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