FC5 and Dell D810: still no DMA for CD/DVD drive

[wwp]

Hello Bill,


On Wed, 29 Mar 2006 16:15:16 +0100 William John Murray <W.J.Murray at rl.ac.uk> wrote:

>   
> On Wed, 2006-03-29 at 10:02 -0500, fedora-list-request at redhat.com wrote:
> > 
> > I've just installed FC5 on my Dell D810, everything went fine w/
> > regard to
> > the hardware, but the CD/DVD drive still shows very poor xfer rates
> > and eats
> > CPU (last tried: FC3, it was the same w/ ~1.4MB/sec). I thought that
> > FC5's
> > kernel was able to enable DMA for IDE drives controlled by a SATA
> > (disk
> > is /dev/sda, dvd drive is /dev/hdc), am I wrong?
> > 
> > 
> > Regards,
> > 
> > -- 
> > wwp 
> 
>    Hi there,
>          In the test phase I had to add 'hdc-noprobe' to my kernel
> parameters, and it works so I never took it off..

Ah! With hdc=probe, I get better results.. Now the drive is /dev/scd0 and
reading doesn't eats all CPU, thanks!

The bad thing is that the xfer rate is a bit better but quite slow anyway:
reading a 700MB .avi file -> it was up to 2.6MB/sec, hdparm -t says 1.6MB/sec.


Regards,

-- 
wwp
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