def intfOptions():
"run various traffic control commands on a single interface"
net = Mininet(autoStaticArp=True)
net.addController('c0')
h1 = net.addHost('h1')
h2 = net.addHost('h2')
s1 = net.addSwitch('s1')
link1 = net.addLink(h1, s1, cls=TCLink)
net.addLink(h2, s1)
net.start()
# flush out latency from reactive forwarding delay
net.pingAll()
info('\n*** Configuring one intf with bandwidth of 5 Mb\n')
link1.intf1.config(bw=5)
info('\n*** Running iperf to test\n')
net.iperf()
info('\n*** Configuring one intf with loss of 50%\n')
link1.intf1.config(loss=50)
info('\n')
net.iperf((h1, h2), l4Type='UDP')
info('\n*** Configuring one intf with delay of 15ms\n')
link1.intf1.config(delay='15ms')
info('\n*** Run a ping to confirm delay\n')
net.pingPairFull()
info('\n*** Done testing\n')
net.stop()
def perfTest(lossy=True):
"Create network and run simple performance test"
topo = SingleSwitchTopo(n=4, lossy=lossy)
net = Mininet(topo=topo,
host=CPULimitedHost,
link=TCLink,
autoStaticArp=True)
net.start()
print "Dumping host connections"
dumpNodeConnections(net.hosts)
print "Testing bandwidth between h1 and h4"
h1, h4 = net.getNodeByName('h1', 'h4')
net.iperf((h1, h4), l4Type='UDP')
net.stop()
def verySimpleLimit(bw=150):
"Absurdly simple limiting test"
intf = custom(TCIntf, bw=bw)
net = Mininet(intf=intf)
h1, h2 = net.addHost('h1'), net.addHost('h2')
net.addLink(h1, h2)
net.start()
net.pingAll()
net.iperf()
h1.cmdPrint('tc -s qdisc ls dev', h1.defaultIntf())
h2.cmdPrint('tc -d class show dev', h2.defaultIntf())
h1.cmdPrint('tc -s qdisc ls dev', h1.defaultIntf())
h2.cmdPrint('tc -d class show dev', h2.defaultIntf())
net.stop()
def linearBandwidthTest(lengths):
"Check bandwidth at various lengths along a switch chain."
results = {}
switchCount = max(lengths)
hostCount = switchCount + 1
switches = {
'reference user': UserSwitch,
'Open vSwitch kernel': OVSKernelSwitch
}
# UserSwitch is horribly slow with recent kernels.
# We can reinstate it once its performance is fixed
del switches['reference user']
topo = LinearTestTopo(hostCount)
# Select TCP Reno
output = quietRun('sysctl -w net.ipv4.tcp_congestion_control=reno')
assert 'reno' in output
for datapath in switches.keys():
print "*** testing", datapath, "datapath"
Switch = switches[datapath]
results[datapath] = []
link = partial(TCLink, delay='1ms')
net = Mininet(topo=topo,
switch=Switch,
controller=Controller,
waitConnected=True,
link=link)
net.start()
print "*** testing basic connectivity"
for n in lengths:
net.ping([net.hosts[0], net.hosts[n]])
print "*** testing bandwidth"
for n in lengths:
src, dst = net.hosts[0], net.hosts[n]
# Try to prime the pump to reduce PACKET_INs during test
# since the reference controller is reactive
src.cmd('telnet', dst.IP(), '5001')
print "testing", src.name, "<->", dst.name,
bandwidth = net.iperf([src, dst], seconds=10)
print bandwidth
flush()
results[datapath] += [(n, bandwidth)]
net.stop()
for datapath in switches.keys():
print
print "*** Linear network results for", datapath, "datapath:"
print
result = results[datapath]
print "SwitchCount\tiperf Results"
for switchCount, bandwidth in result:
print switchCount, '\t\t',
print bandwidth[0], 'server, ', bandwidth[1], 'client'
print
print
