[wplug] DMA

[Coutch, Robert]

I'll ask the obvious.

Does you mother board/IDE controller support DMA or UDMA transfers?
Does the DVD drive support DMA or UDMA.

Is the drive IDE of SCSI?

If it's IDE, are you using scsi emulation for a DVD/CD-R/W drive?

-Bob

-----Original Message-----
From: R.E.Coutch [mailto:coutchre at usaor.net]
Sent: Tuesday, March 11, 2003 5:27 PM
To: coutchre at tvratings.com
Subject: [wplug] DMA


I'm trying to play DVDs using xine and it is very jerky.  After 
searching on google, I noticed that a lot of people say to turn DMA on 
for your DVD drive.  However, when I try, I get the following error:

[root at localhost linux-2.4]# hdparm -d1 /dev/hdd

/dev/hdd:
 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Operation not permitted
 using_dma    =  0 (off)

Is there some other way to turn it on. I'm thinking that I will need to 
recompile the kernel, but I'm not quite sure which setting I need to 
turn on.  Here's my system:

[root at localhost linux-2.4]# uname -a
Linux localhost.localdomain 2.4.18-14 #1 Wed Sep 4 12:13:11 EDT 2002 
i686 athlon i386 GNU/Linux

-Henry

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