lantz
cf5675876c
1. update/fix codecheck Run workflow with pylint 2.15.7 Add a bunch of fiddly and mostly cosmetic changes to make pylint (and make codecheck) happy. Also try to run pyflakes3 vs. pyflakes 2. remove Ubuntu 18.04 Ubuntu 18.04 has been removed from github actions, so we remove it from our workflow as well
127 lines
3.9 KiB
Python
Executable File
127 lines
3.9 KiB
Python
Executable File
#!/usr/bin/env python
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"""
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Test bandwidth (using iperf) on linear networks of varying size,
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using both kernel and user datapaths.
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We construct a network of N hosts and N-1 switches, connected as follows:
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h1 <-> s1 <-> s2 .. sN-1
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h2 h3 hN
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WARNING: by default, the reference controller only supports 16
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switches, so this test WILL NOT WORK unless you have recompiled
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your controller to support 100 switches (or more.)
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In addition to testing the bandwidth across varying numbers
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of switches, this example demonstrates:
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- creating a custom topology, LinearTestTopo
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- using the ping() and iperf() tests from Mininet()
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- testing both the kernel and user switches
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"""
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import sys
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from functools import partial
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from mininet.net import Mininet
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from mininet.node import UserSwitch, OVSKernelSwitch, Controller
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from mininet.topo import Topo
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from mininet.log import lg, info
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from mininet.util import irange, quietRun
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from mininet.link import TCLink
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flush = sys.stdout.flush
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class LinearTestTopo( Topo ):
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"Topology for a string of N hosts and N-1 switches."
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# pylint: disable=arguments-differ
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def build( self, N, **params ):
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# Create switches and hosts
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hosts = [ self.addHost( 'h%s' % h )
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for h in irange( 1, N ) ]
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switches = [ self.addSwitch( 's%s' % s )
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for s in irange( 1, N - 1 ) ]
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# Wire up switches
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last = None
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for switch in switches:
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if last:
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self.addLink( last, switch )
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last = switch
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# Wire up hosts
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self.addLink( hosts[ 0 ], switches[ 0 ] )
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for host, switch in zip( hosts[ 1: ], switches ):
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self.addLink( host, switch )
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def linearBandwidthTest( lengths ):
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"Check bandwidth at various lengths along a switch chain."
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results = {}
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switchCount = max( lengths )
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hostCount = switchCount + 1
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switches = { 'reference user': UserSwitch,
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'Open vSwitch kernel': OVSKernelSwitch }
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# UserSwitch is horribly slow with recent kernels.
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# We can reinstate it once its performance is fixed
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del switches[ 'reference user' ]
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topo = LinearTestTopo( hostCount )
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# Select TCP Reno
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output = quietRun( 'sysctl -w net.ipv4.tcp_congestion_control=reno' )
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assert 'reno' in output
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for datapath, Switch in switches.items():
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info( "*** testing", datapath, "datapath\n" )
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results[ datapath ] = []
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link = partial( TCLink, delay='30ms', bw=100 )
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net = Mininet( topo=topo, switch=Switch,
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controller=Controller, link=link,
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waitConnected=True )
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net.start()
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info( "*** testing basic connectivity\n" )
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for n in lengths:
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net.ping( [ net.hosts[ 0 ], net.hosts[ n ] ] )
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info( "*** testing bandwidth\n" )
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for n in lengths:
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src, dst = net.hosts[ 0 ], net.hosts[ n ]
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# Try to prime the pump to reduce PACKET_INs during test
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# since the reference controller is reactive
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src.cmd( 'telnet', dst.IP(), '5001' )
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info( "testing", src.name, "<->", dst.name, '\n' )
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# serverbw = received; _clientbw = buffered
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serverbw, _clientbw = net.iperf( [ src, dst ], seconds=5 )
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info( serverbw, '\n' )
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flush()
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results[ datapath ] += [ ( n, serverbw ) ]
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net.stop()
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for datapath in switches:
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info( "\n*** Linear network results for", datapath, "datapath:\n" )
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result = results[ datapath ]
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info( "SwitchCount\tiperf Results\n" )
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for switchCount, serverbw in result:
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info( switchCount, '\t\t' )
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info( serverbw, '\n' )
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info( '\n')
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info( '\n' )
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if __name__ == '__main__':
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lg.setLogLevel( 'info' )
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sizes = [ 1, 2, 3, 4 ]
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info( "*** Running linearBandwidthTest", sizes, '\n' )
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linearBandwidthTest( sizes )
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