Tossed a DVD into the player this evening and the play was extremely choppy. So I bugged out to toss this command in and received:
root:# hdparm -d1 /dev/dvd
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
using_dma = 0 (off)
As I understand it, to get this to work involves a recompile of the kernel. First question is, how and what do I use to get DMA to work, and second, why isn't DMA included as default?