[linux-dvb] SAA7146 DMA buffer overflow - delayed interrupts ?

Manu Abraham abraham.manu at gmail.com
Sat Feb 25 18:52:14 CET 2006


Jon Burgess wrote:
> Ingo Schneider wrote:
>> It seems that the SAA7146 Interrupts are delayed for a very long time 
>> while the rest of the system runs fine - very strange !
>
> Are you measuring the time in the context of the interrupt handler 
> e.g.   ttpci_budget_irq10_handler() or in the vpeirq tasklet? I 
> believe that the tasklet may be delayed for some time if there are 
> other tasklets active or if softirqd is busy doing other things.

The tasklet is indeed delayed. For the 878 based cads, this is a very 
big issue. I have been doing somewhat similar things at my side ..
http://thadathil.net:8000/cgi-bin/hgwebdir.cgi/v4l-dvb-bt8xx-test

Still incomplete though.


Manu




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