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Home > Archive > alt.os.linux > December 2002 > DMA: Is it to a particular drive?
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DMA: Is it to a particular drive?
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| =?ISO-8859-1?Q?Jos=E9?= Arango 2002-12-17, 11:26 pm |
| Hello everyone,
I have a DVD drive (/dev/hdc) and a hard-disk (/dev/hdd) on my 2nd IDE
controller. I want to activate DMA since it would help for DVD playback.
However, my hard-disk (hdd) is really old and It doesn't support DMA. My
question is: Can I just activate DMA for the DVD drive? or is it like when
you activate DMA ..does it apply to the whole IDE controller?
I'm using SuSE 7.2 and I went to YaST2 and I turned on DMA...but when I boot
I get a couple of nasty messages regarding DMA and hdd.... so that's the
reason I would like to know if in fact DMS does apply to a particular drive
or to the controller (both drives).
Thanks in advance,
Jose
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| Anthony Irwin 2002-12-17, 11:26 pm |
| "José Arango" <arango@caribe.net> wrote in message
news:uvvur23j8iat21@corp.supernews.com...
> Hello everyone,
>
> I have a DVD drive (/dev/hdc) and a hard-disk (/dev/hdd) on my 2nd IDE
> controller. I want to activate DMA since it would help for DVD playback.
> However, my hard-disk (hdd) is really old and It doesn't support DMA. My
> question is: Can I just activate DMA for the DVD drive? or is it like when
> you activate DMA ..does it apply to the whole IDE controller?
>
> I'm using SuSE 7.2 and I went to YaST2 and I turned on DMA...but when I
boot
> I get a couple of nasty messages regarding DMA and hdd.... so that's the
> reason I would like to know if in fact DMS does apply to a particular
drive
> or to the controller (both drives).
>
> Thanks in advance,
> Jose
Hi,
Try the following as root.
hdparm -d 1 /dev/hdc
Kind Regards,
Anthony Irwin
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| Bill Unruh 2002-12-18, 12:25 am |
| =?ISO-8859-1?Q?Jos=E9?= Arango <arango@caribe.net> writes:
]Hello everyone,
]I have a DVD drive (/dev/hdc) and a hard-disk (/dev/hdd) on my 2nd IDE
]controller. I want to activate DMA since it would help for DVD playback.
]However, my hard-disk (hdd) is really old and It doesn't support DMA. My
]question is: Can I just activate DMA for the DVD drive? or is it like when
]you activate DMA ..does it apply to the whole IDE controller?
Yes, one at a time.
hdparm -d1 /dev/hdc
(If you do not have hdparm, get it, it will be on the distribution disks
somewhere.)
]I'm using SuSE 7.2 and I went to YaST2 and I turned on DMA...but when I boot
]I get a couple of nasty messages regarding DMA and hdd.... so that's the
]reason I would like to know if in fact DMS does apply to a particular drive
]or to the controller (both drives).
Most distros automatically start up dma for all disk drives. You can
disable it, but it depends on the distribution (look for hdparm in
/etc/rc.sysinit or rc.local
]Thanks in advance,
]Jose
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| Paul Lutus 2002-12-18, 1:24 am |
| On Wed, 18 Dec 2002 00:40:43 +0000, José Arango wrote:
> Hello everyone,
>
> I have a DVD drive (/dev/hdc) and a hard-disk (/dev/hdd) on my 2nd IDE
> controller. I want to activate DMA since it would help for DVD playback.
> However, my hard-disk (hdd) is really old and It doesn't support DMA. My
> question is: Can I just activate DMA for the DVD drive? or is it like when
> you activate DMA ..does it apply to the whole IDE controller?
# hdparm -d1 /dev/hdc
--
Paul Lutus
http://www.arachnoid.com
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