[linux-dvb] Re: we might be losing multicast packets

[Jeremy Hall <jhall@maoz.com>]

Hello,

Does anybody use multicast and dvb? Is anybody else seeing something 
similar?

_J

In the new year, Jeremy Hall wrote:
> Hello,
> 
> I am using current dvb-kernel v2.4 branch with a dvb/s ff card.  I am 
> using dvbnet that I found in some apps dir on my hd, no telling how old it 
> is, but I run dvbnet -p pidnum to get a dvb0_0 and another one for dvb0_1.
> 
> The datarate for dvb0_1 is small, like 64k, so I don't see losing packets, 
> but dvb0_0 is like 7 or 8 megabits per second.
> 
> I have a program sched_fifo with mlockall (MCL_CURRENT|MCL_FUTURE) that 
> reads a packet and writes it to disk in a single thread.  What is the 
> possability we are losing packets? I'm noticing some sequence gaps, and 
> when the application wants like 97,000 packets of 1400 bytes or so, a few 
> hundred somehow wind up missing.
> 
> I don't know if it's dropping them a few at a time or in bulk while the 
> disk runs.  I manually watched about 200 go by in sequence before my eyes 
> started glazing over.  I skipped to the end of the warnings file and 
> noticed the missing packets.
> 
> Is there any way I can make my driver use the budget routines instead of 
> the firmware ones? I'd rather my CPU do the work than the one on the arm 
> if the arm isn't going to work reliably.
> 
> Thanks in advance.
> 
> _J
> 
>