Dma

InsaneBob · 07-13-2003, 07:56 PM

I activated dma on /dev/hdc to speed up my dvd playback on xine. The commands I used was hdparm -d1 /dev/hdc but whenever I restart the comp it switches back to it being deactivated. What option do I add to fstab to activated it on startup.

DrOzz · 07-13-2003, 08:02 PM

add that same line to your rc.local file.
and also add:
options hdc-cd dma=1
to your /etc/modules.conf file

InsaneBob · 07-13-2003, 08:04 PM

thanks

DrOzz · 07-13-2003, 08:25 PM

did it work alright?

InsaneBob · 07-13-2003, 10:38 PM

Ya it worked I was wondering though if I should activate dma for my hard drive too?

LoungeLizard · 07-13-2003, 10:48 PM

I would you will see a big difference in proformance if you do

Bruce Hill · 07-15-2003, 08:45 PM

Quote:

Originally posted by LoungeLizard
I would you will see a big difference in proformance if you do

I changed I/O from 16-bit to 32-bit, and enabled DMA, and only saw a change from 47.06 MB/sec to 47.41 MB/sec, and I don't even know if these times are good or not. I would like to hear what someone has to say about this.

crashmeister · 07-16-2003, 05:49 AM

Just do hdparm -I /dev/whatever and you'll see what is enabled.There is a * beside the mode that is currently running - like *udma5 or whatever is on.
I only get 30 MB/sec out of my drive.