[MPlayer-users] MPlayer performance degradation after system upgrade

[D Richard Felker III]

On Mon, Feb 17, 2003 at 03:22:43PM +0800, ephemeron at softhome.net wrote:
> > > DMA settings are already enabled on all my IDE disks except
> > > for the DVD drive.
> > > 
> > > [root]# dmesg | grep -i dvd
> > > hdc: ATAPI 40X DVD-ROM drive, 512kB Cache
> > > [root at gnu root]# hdparm -d 1 /dev/hdc
> > > 
> > > /dev/hdc:
> > >  setting using_dma to 1 (on)
> > >  HDIO_SET_DMA failed: Operation not permitted
> > >  using_dma    =  0 (off)
> > > 
> > > hum, dma cannot be set ! is this a feature ?
> > 
> > Yes, this is a "feature" of Redhat 8 to "protect" you from
> > yourself.  You have to set a special option for ide cdrom in
> > modules.conf to enable dma, then *also* use hdparm. I forget
> > what the option is called; look through the archives. Then mail
> > Redhat and tell them how idiotic they are for doing this!!
> 
> I can understand why one might want to disable DMA on a hard
> disk. I have what appears to be a crappy (or simply too old)
> VIA-based mobo that produces regular fsck errors when DMA is
> enabled on the hard drive. But what's the benefit of disabling
> DMA on a *read-only* CD/DVD drive?

Leave it to the geniuses at RedHat to explain this one to you. :))

Rich