Dma

Radical Edward · 10-08-2004, 09:03 AM

Hey anyone out there who can tell me how to turn on DMA under linux? First time I have compiled it from scratch myself and I'm not sure how to do it.

Oliv' · 10-08-2004, 09:21 AM

Code:

man hdparm

Oliv'

rcrules · 10-08-2004, 09:22 AM

(as root/su):
hdparm -d1 (device)
That's it. If you want to just find out what the setting is on currently, just do
hdparm -d (device)

It's often handy to turn on DMA in your startup scripts, too, if it isn't already on by default. If it's already on by default, you don't even need to worry about it. (a lot of times it's already on by default, but check first)

Hope this helps

Radical Edward · 10-08-2004, 09:54 AM

Well it's what I was looking for but now when I try to set the DMA to on, it just tell me that the operation is not permitted and laughs in my face. But yeah, it was very helpful. Where would I find the startup scripts anyways? This is the first time I have compiled linux from scratch myself, so the install always did it for me before (Redhat, bleah). I like doing it this way much better, works cleaner but at this point I don't know where anything is to modify it myself. Any other help would be apprecaited.

Oliv' · 10-08-2004, 10:12 AM

Well if your hard drive supports DMA and that Linux does not want to enable it, it means that you forgot an option in your kernel compilation... So you should look closer ATA/IDE/MFM/RLL support section and IDE, ATA and ATAPI Block devices subsection to be precise

Oliv'