Hello list, I'm having trouble getting my dvd (Pioneer DVD-ROM ATAPI Model DVD-106S 012) to use dma. Whenever I try to set it (as root) I get: --------------------------------------------- # /sbin/hdparm -d1 /dev/hdc /dev/hdc: setting using_dma to 1 (on) HDIO_SET_DMA failed: Operation not permitted using_dma = 0 (off) --------------------------------------------- Could anyone explain to me how I could get it working? :-) Thanks in advance! Johan > Message: 13 > Date: Tue, 8 Oct 2002 12:06:26 -0400 (EDT) > From: "Robert P. J. Day" <rpjday@mindspring.com> > To: psyche mailing list <psyche-list@redhat.com> > Subject: DVDs, hdparm and stuff like that > Reply-To: psyche-list@redhat.com > > > having gotten DVDs to play on my inspiron 8100, i thought > i'd post a quick summary of what i did, and finish with a > couple of questions. > > from www.freshrpms.net, to use ogle (i've never had good > luck with xine, so someone else can jump in here if they > want): > > alsa-lib > libdvdcss > libdvdread > ogle > ogle_gui > > and now for the fun part -- getting decent playback. since > this involves DMA (among other possible things), i tested > things on my hard drive first. some benchmark testing: > > # hdparm -t /dev/hda > > showed that i could speed things up nicely by enabling DMA: > > # hdparm -d 1 /dev/hda > # hdparm -t /dev/dha (ooh, 5 times the throughput) > > you can make this setting permanent by adding the line > > USE_DMA=1 > > in /etc/sysconfig/harddisks. > > so, given that my DVD drive is technically /dev/hdb, i can > enable DMA on that as well: > > # hdparm -d 1 /dev/hdb > > and that pretty much gives me nice, smooth playback. however, > a caveat -- to set this on a permanent basis, you can't just rely > on the USE_DMA line /etc/sysconfig/harddisks, since that file > is only used as the default for actual disks, as i found out > the hard way after reading /etc/rc.sysinit. > > instead, just create the file /etc/sysconfig/harddiskhdb, > with the single line > > USE_DMA=1 > > and you're all set. > > yes, i know all this is pretty trivial stuff, but enough > people have been asking about DVDs, i figure it was worth > posting. > > comments? additions? > > rday > > p.s. i noticed that setting 32-bit IO support (EIDE_32BIT=1) > didn't make a noticeable difference for the hard drive once DMA > is already enabled. i suspect it wouldn't hurt, but it just > didn't seem to have any benefit. (it *does* make a difference > if DMA is not enabled, however).
Attachment:
signature.asc
Description: This is a digitally signed message part
