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Hi Richard,


Richard Rauch wrote:
 > On 1.5.2 (customized config but standard sources), when I boot my DVD
 > player is recognized as a UDMA 2 device.
 >
 > When I try to play a DVD movie, it degrades through UDMA 1, DMA 2, to PIO
 > 4, claiming lost interrupts:

[...]

 > My questions are:
 >
 >  * Is this at all normal or expected?

I dont't know this particular Maxtor IDE controller, but it seems it has 
a Promise chipset. Some of these IDE controller chipsets which can be 
found on add-on PCI boards are not really ATAPI controllers but instead 
just feature the command set neccessary to control hard disk drives. 
Thus, it may be that you simply can't use this controller with your DVD 
drive (although even if it is no ATAPI controller many CD-ROM drives do 
work and problems arise when connecting a CD-RW drive). Anyway, 
connecting a DVD drive might just be unsopported.

 >  * Is DMA or UDMA important for DVD playback?  (Even on my PCI video 
card,

It is. In fact, when watching DVD movies on systems without DMA you 
often experience a "stop" for maybe half a second or so everytime the 
DVD is accessed (which usually is quite often). On DMA-enabled systems 
you don't face this problem. (Well, at least not due to the lack of DMA 
transfers :-)

 >    I get 18fps in 16bpp, or 12fps in 24bpp, according to Ogle.  I 
probably
 >    won't be doing much else with my computer while watching a movie,
 >    so as long as I can get full frame rates with an eventual AGP card,
 >    this isn't a huge matter.)

Equipped with *any* modern AGP card, your system should be more than 
able to playback DVD movies without frame drops.

Bye, K&K,
T-Zee
-- 
thiesi@NetWork23.Sytes.NET ---- NetBSD: Power to the people!
Tel.: ++49-(0)171-416 05 09 -- Fax: ++49-(0)171-134 16 05 09
Mirko Thiesen, P.O. Box 26 03 54, D-13413 Berlin, W. Germany
              "We're with you all the way, mostly"

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