[linux-dvb] Channel switching, DVB-C

[Lauri Pesonen <lauri.pesonen@firsthop.com>]

Hi list,

I've had my DVB stuff running now for a month and a half. Latest 
improvement was tuning to the <200MHz frequencies which was not possible 
earlier. Chanegin the freq. limits in tuner.c helped there.

Now I'm pretty satisfied with everything except that tuning is not very 
reliable. [I have no idea whether DVB-S/T users suffer from these problems 
] When I switch from channel A to channel B within the same bouquet, 
switching is realtively fast (slower than with an analog TV) and switching 
works like clockwork. But when I switch from  channel A to channel B and 
the two channels are on separate bouquets the actual switching takes a 
long time (several seconds) and sometimes the switch is never completed. 
VDR's switching code will time out (I changed the timeout from 5secs to 
10secs). It looks like the problem lies in the driver rather than VDR.

So my question is, is there any way I can improve the performance? How 
do different variables in e.g. tuner.c affect the behaviour? Are there 
some vars I could play with in order to improve switching? 

I changed the delay from HZ to 2*HZ in the zigzag function in tuner.c. 
Before that I was not able to tune at all. Could switching be improved by 
fine tuning this variable?

BR, Lauri


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