> -----Original Message----- > From: Keith Winston [mailto:kwinston@twmi.rr.com] > Sent: Thu, January 09, 2003 8:08 PM > To: psyche-list@redhat.com > Subject: Re: DVD DMA > > > On Thu, 2003-01-09 at 12:29, Anton Piatek wrote: > > Hi, i am trying to enable dma in Redhat 8 on my dvd drive, so i can > > watch dvds. mplayer plays them, except that they are jerky > when the dvd > > has to keep reading, then pauses between reads. I tried > adjusting cache > > options for mplayer with no luck, and tried adjusting the > speed of the > > drive. > > > > does anyone know why > > > > |# hdparm -d1 /dev/cdrom > > | > > |/dev/cdrom: > > | setting using_dma to 1 (on) > > | HDIO_SET_DMA failed: Operation not permitted > > | using_dma = 0 (off) > > > > fails. the dvd drive is a fairly nice (panasonic?) dvd > drive, that plays > > dvds admirably in windows (when media player will let it...) > > I had the same problem initially. By default, Red Hat does not allow > DMA on for _some_ IDE CD-ROMs and DVDs. To allow DMA to be turned on, > add this line to the /etc/modules.conf file: > > options ide-cd dma=1 Another way may be to copy /etc/sysconfig/harddisks to /etc/sysconfig/harddiskhd<your cdrom dev> and change the line #USE_DMA=0 to USE_DMA=1 I don't remember why you can't change DMA in run-time, I think it related to disk being mounted/unmounted, but not sure. Pavel. > > It fixed my performance problems. > > Best Regards, > Keith > -- > LPIC-2, MCSE, N+ > We drive on this highway of fire > Got spam? Get spastic http://spastic.sourceforge.net > > > > -- > Psyche-list mailing list > Psyche-list@redhat.com > https://listman.redhat.com/mailman/listinfo/psyche-list > -- Psyche-list mailing list Psyche-list@redhat.com https://listman.redhat.com/mailman/listinfo/psyche-list
