If your DVD is not a burner, you don't need ide-scsi. Turn that off first, then add to /etc/modules.conf: options ide-cd dma=1 (This is in the RELEASE-NOTES, IIRC.) On Tue, 2002-10-08 at 14:38, Johan Andersson wrote: > 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). -- Chris Kloiber
