[linux-dvb] Re: [PATCH] fix for stream corruption on budget /Nova-T cards

[Jon Burgess <mplayer@jburgess.uklinux.net>]

Andreas Vierengel wrote:


> hi,
> your patch doesn't work for me (P4-Celeron 2.4GHz, i845GE Chipset).
> sorry !
> However I tested all combinations of burst and treshold settings for
> Video-DMA-Channel #3 in PCI_BT_V1. Results are below.
> However I actually do get stream corruption on my Nexus-s as well, but
> they are very rare. So I applied the same burst/treshold settings to my
> nexus-s as well. Things are now perfect on both cards, but as Jon said:
> "this only indirectly avoids the problem and doesn't actually fix it."
[ Results from a good set of test deleted to save space ]

It is good that you can get it to work well. You results imply that 
increasing the threshold does seem to make it work better for you.

I might have been simplifying the "burst size" issue a bit too much. 
There may well be issues with doing big bursts on the bus.

Do you use the built video of the 845G?

I would be interested to know how the shared memory of the 845G video 
effects the PCI bus. The PCI bus must get interrupted frequently as the 
video chip refills the display FIFO.

A PCI bus analyzer would be needed to really understand what is going on.

	Jon







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