lantz
62 lines
1.9 KiB
Python
Executable File
62 lines
1.9 KiB
Python
Executable File
#!/usr/bin/python
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"""
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Simple example of setting network and CPU parameters
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NOTE: link params limit BW, add latency, and loss.
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There is a high chance that pings WILL fail and that
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iperf will hang indefinitely if the TCP handshake fails
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to complete.
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"""
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from sys import argv
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from mininet.topo import Topo
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from mininet.net import Mininet
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from mininet.node import CPULimitedHost
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from mininet.link import TCLink
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from mininet.util import dumpNodeConnections
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from mininet.log import setLogLevel, info
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# It would be nice if we didn't have to do this:
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# pylint: disable=arguments-differ
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class SingleSwitchTopo( Topo ):
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"Single switch connected to n hosts."
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def build( self, n=2, lossy=True ):
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switch = self.addSwitch('s1')
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for h in range(n):
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# Each host gets 50%/n of system CPU
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host = self.addHost('h%s' % (h + 1),
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cpu=.5 / n)
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if lossy:
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# 10 Mbps, 5ms delay, 10% packet loss
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self.addLink(host, switch,
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bw=10, delay='5ms', loss=10, use_htb=True)
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else:
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# 10 Mbps, 5ms delay, no packet loss
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self.addLink(host, switch,
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bw=10, delay='5ms', loss=0, use_htb=True)
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def perfTest( lossy=True ):
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"Create network and run simple performance test"
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topo = SingleSwitchTopo( n=4, lossy=lossy )
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net = Mininet( topo=topo,
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host=CPULimitedHost, link=TCLink,
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autoStaticArp=True )
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net.start()
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info( "Dumping host connections\n" )
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dumpNodeConnections(net.hosts)
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info( "Testing bandwidth between h1 and h4\n" )
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h1, h4 = net.getNodeByName('h1', 'h4')
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net.iperf( ( h1, h4 ), l4Type='UDP' )
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net.stop()
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if __name__ == '__main__':
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setLogLevel( 'info' )
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# Prevent test_simpleperf from failing due to packet loss
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perfTest( lossy=( 'testmode' not in argv ) )
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