multi network card general setup question

I have 2 Network card in my QNX box. 1 is 100Mbit/s and the second one is 1000Mbits/s card. QNX automatically setup both network card and when I go into “phlip” I see en0 (100Mbits card) and en1 (1000Mbit card) respectively. The problem I am having is that I have a real-time requirement communication (6 Mbytes/s or more) happening with my en1 device, but it is having trouble keeping up.
I found that once I disable en0 or even unplug the network cable from en0 this problem goes away. So I am thinking has to do with how io-net is servicing both network card and how traffic from en0 can hold service required from en1. Is there a way to setup the io-net so that we can service the two network card at a different priority? I cannot afford any retransmission or data loss from en1, but I don’t care if en0 losses data because nothing in that connection has any hard real-time constraints. Thanks in advance for your help. I would appreciate how I can modify the boot script (or script I can put in /etc/rc.d/ in QNX to make this work.

What version of OS are you using, what is you card model?

i’m running 6.3.2 and and

You should be able to set the priority of each driver with the argument priority=xxx. It would also be a good idea to increase the number of rx and tx descriptor for the 82544 driver ( we use 4096 ).

If this is a standard setup I believe you can edit the net enum database file to add these arguments.

just changing the priority doesn’t seem to work, I still have the issue. But when I run a completely seperate TCP/IP stack the issue is gone.

how can I in the net enum file add this option so that my starts like this.

io-net -i1 -di82544 priority=24 receive=4096 transmit=4096 -ptcpip prefix=/sock2


If two io-net solves the problem then it’s not a priority problem. Either it’s a flaw in io-net or there is something in your config that screws up io-net.

Don’t know the answer about your enum file question.