tx_wr_pkt_to_bram seems ok now
disabling take_your_chances iperf works but i don't know where the problem is. I am sure it's because it loose synch. have to investigate where
iperf seems to work in both directions.
results:
client           -->    server     : bandwidth
intel_nic               nf0        : 1.19 Gbit/s
nf0                     intelnic   : 500 Mbits/s