[linux-dvb] Re: datarates: any experiences?

[Ralph Metzler <rjkm@convergence.de>]

Bart De Gruyter writes:
 > The tcp/ip stack definitely filters out the data somewhere
 > as I've also changed the priority of the receiving program
 > to -20 and the linux box is doing nothing else ;-)
 > 
 > I'll move my question to a more linux tcp/ip stack related
 > list as it is getting off topic here.
 > 
 > Thanks for reassuring that when the ifconfig has it in the
 > stats then the linux tcp/ip stack should have received it.


It received it but the TCP/IP stack still might have dropped it. 
I currently only declare the packet dropped if I did not get 
a buffer from the network layer. 
I do not check what netif_rx() returns.
You could change the DVB network driver to use the return value 
of netif_rx() in the statistics. The possible return values are:

NET_RX_SUCCESS	(no congestion)           
NET_RX_CN_LOW     (low congestion) 
NET_RX_CN_MOD     (moderate congestion)
NET_RX_CN_HIGH    (high congestion) 
NET_RX_DROP    (packet was dropped)

This way you can be absolutely certain if the upper layers dropped
the packet or something else went wrong.


Ralph


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