Performance Measurement (Get the Packet Delay)

[Description]

When we use iperf, we can easily get the throughput. But not for packet end-to-end delay. So I will show another method to get the delay

[Topology]

H1---(1ms delay)----S1---(1ms delay)----H2

[mininet script]

#!/usr/bin/env python

from mininet.cli import CLI

from mininet.net import Mininet

from mininet.link import Link,TCLink,Intf

from mininet.node import RemoteController

if '__main__' == __name__:

net = Mininet(link=TCLink)

h1 = net.addHost('h1')

h2 = net.addHost('h2')

s1 = net.addSwitch('s1')

c0 = net.addController('c0', controller=Controller, ip='127.0.0.1', port=6633)

linkopts0=dict(bw=20, delay='1ms', loss=0)

net.addLink(h1, s1, cls=TCLink, **linkopts0)

net.addLink(s1, h2, cls=TCLink, **linkopts0)

net.build()

c0.start()

s1.start([c0])

CLI(net)

net.stop()

[Execution]

Use the following command at the sender and receiver to capture packets sent and received. (check https://www.tcpdump.org/tcpdump_man.html for tcpdump parameters)

Here we use iperf to transmit packets from h1 to h2

After transmitting, we can get “sent” and “received” files. The contents of “sent” or “received” are something like

1523169506.233021 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 10.0.0.2 tell 10.0.0.1, length 28

1523169506.243542 IP (tos 0x0, ttl 64, id 11325, offset 0, flags [DF], proto UDP (17), length 1498)