can´t enable DMA-Mode why?
 

Hello,

I have SuSE 8.1 with KDE 3.1.something ;-) running.
When I try to enable DMA-Mode with Systemadministration by YaST for either the harddisks and the DVD-Rom. Yast tells me "error - couldn´t set device hda (and hdc and hdd; everyone after another) to value `1´. And so when i start yast again i see the current state is all of them are DMA-disabled.

Is there another way or what could it be?

I have also an SuSE 8.1 one withe the original KDE 3.0 running and it does not function either.

Thanks a lot

Odan

from the c0ommand line
as root

hdparm -d1 /dev/hda

this is the command to enable dma
if it responds ok

(under mandrake and redhat)
i add that line to the end of /etc/rc.local

(i also add -c1 (to switch 32bit support on) and -k1 (tells it to keep settings after a reset))

hdparm
 

Thanks,

but hdparm does not work either.
it just tells thatit can´t set hda with DMA on.

Could there be another way or a bios thing or something

Thanks

Odan

If you've got bleeding edge hardware or a bleeding edge motherboard, you'll probably need a newer kernel to support the hardware. I'd give that a try first.

I know when I was using Slackware 9 with the default kernel 2.4.20 I couldn't get proper hard drive settings to work either. I was getting 3mb/s disk reads. Compiled 2.4.22, did hdparm, and got 40mb/s disk reads.

Yeah, you need to have ultra-dma enabled in the kernel, I had this problem too.

First thing to check -- Is 32 bit LBA operation enabled?

see if this works:

hdparm -c1 /dev/hda

That'll switch it 32 (i know it's already mentioned above, but I wanted to stress it.)

IF that goes through, then try

hdparm -d1 /dev/hda

IF neither go through, you'll need to recompile your kernel with dma support.

-Shade

root@darkstar:/home/h1tman# hdparm -c1 /dev/hda

/dev/hda:
setting 32-bit IO_support flag to 1
IO_support = 1 (32-bit)
root@darkstar:/home/h1tman# hdparm -d1 /dev/hda

/dev/hda:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
using_dma = 0 (off)
root@darkstar:/home/h1tman#

compiling
 

Hi guys,

i get the same with hdparm as "h1tman" does. So, how do i compile the kernel?

Thanks

Odan

Please,

how do i recompile the kernel with DMA support?

Thanks

Odan

I am having the same problem. However DMA is compiled into my kernel, and I am running 2.4.22.

Please refer to >http://www.linuxquestions.org/questi...hreadid=104957

For more of my system information.

slackware 9 has dma support
i've installed it and used it before and hdparm worked first time

is it worth checking the BIOS to see if DMA is turned off?

Well, DMA is enabled by the BIOS and e.g. Windows is using the DMA-Mode.
So how do i figure out my kernel and get a DMA Support compiled, sorry, but i just don´t know.

Thanks