[wplug] DMA

[Zach Paine]

I had those exact errors in my dmesg from my DVD drive.  It is a fairly old 
drive, is yours?  I wouldget bad performance, even with DMA on, and it would 
hang on the same part of movies consistently.  After talking to some people, 
I basically decided that the drive was too old and too crappy to play newer 
DVD's.

	-Zach

On Tuesday 11 March 2003 06:25 pm, Henry Umansky wrote:
> I believe it supports it, because the following works:
>
> [root at localhost linux-2.4]# hdparm -d1 /dev/hda
>
> /dev/hda:
>  setting using_dma to 1 (on)
>  using_dma    =  1 (on)
>
> I'm not sure exactly how to check if its being emulated as a SCSI drive.
> "dmesg" states the following:
>
> <snip>
> hdd: command error: status=0x51 { DriveReady SeekComplete Error }
> hdd: command error: error=0x50
> end_request: I/O error, dev 16:40 (hdd), sector 1448
> hdd: command error: status=0x51 { DriveReady SeekComplete Error }
> hdd: command error: error=0x50
> end_request: I/O error, dev 16:40 (hdd), sector 1452
> hdd: command error: status=0x51 { DriveReady SeekComplete Error }
> hdd: command error: error=0x50
> end_request: I/O error, dev 16:40 (hdd), sector 1220
> </snip>
>
> This goes on for a while, a lot longer than my terminal buffer can
> handle, so I assume it does that through every sector on my DVD drive.
>
> -Henry
>
> Coutch, Robert wrote:
> >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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