How to emulate latency using Ryu SDN application?

Question

I need to emulate network latency using Ryu SDN controller. I first tried to add a sleep time after the decorator which calls a function everytime the controler receives a packet in message but the problem is this function is not able to treat the next packet in until the current is finished. Is there a way to make this function multithread?

@set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
def _packet_in_handler(self, ev):
time.sleep(LATENCY)
...

score 1 · Accepted Answer · answered May 05 '17 at 17:27

1

If you want to emulate network latency, you should rather try to apply the latency to the link rather than the application.

If you are using a network simulator, this may be done in its API (e.g. mininet: mininet.link.TCLink)

If you are using Virtual Machines, you can set up netem to emulate delay on the interfaces you are using.

answered May 05 '17 at 17:27

Hafager

30
3

I'm using a real device. Thanks anyway. – HSC May 10 '17 at 12:20
You can use netem for real physical devices as well. – Hafager May 12 '17 at 10:50

How to emulate latency using Ryu SDN application?

1 Answers1