test tcp congestion fairness on mininet
'''
cd tcp-congestion-mininet
mkdir build &&cd build
cmake ..
make
cd ..
sudo su
python 2h2r.py
'''
client: echo_client.cc
server: echo_server.cc
iperf -s -p 5566 -i 1
iperf -c 10.0.0.2 -p 5566
what a lession I learnt: don not close fd in redis net callback.