[MPlayer-users] MPlayer performance degradation after system upgrade

[ephemeron at softhome.net]

On Sun, 16 Feb 2003 15:50:23 -0500,
D Richard Felker III wrote:
> 
> [Automatic answer: RTFM (read DOCS, FAQ), also read
> DOCS/bugreports.html]
> On Sun, Feb 16, 2003 at 08:23:00PM +0000, Thierry Delaitre
> wrote:
> > [Automatic answer: RTFM (read DOCS, FAQ), also read
> > DOCS/bugreports.html]
> > 
> > On Sun, 16 Feb 2003, Net Llama! wrote:
> > 
> > > [Automatic answer: RTFM (read DOCS, FAQ), also read
> > > DOCS/bugreports.html]
> > > On 02/16/03 11:29, Thierry Delaitre wrote:
> > > > [Automatic answer: RTFM (read DOCS, FAQ), also read
> > > > DOCS/bugreports.html]

[...]

> > 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?