Restored treeping64 and tre1024 examples and updated README.

examples/README

@@ -29,8 +29,18 @@ to an interface in the root namespace (generaly the control network
 already lives in the root namespace, so it does not need to be explicitly
 connected.)
 
+treeping64:
+
+This example creates a 64-host tree network, and attempts to check full
+connectivity using ping, for three different switch/datapath types.
+
+tree1024.py:
+
+This example attempts to create a 1024-host network, and then runs the
+CLI on it. It may run into scalability limits, depending on available
+memory and sysctl configuration (see INSTALL.)
+
 udpbwtest.py:
 
 This example shows how to run a test across an entire network, and monitor
 the output of a set of hosts in real time.
-

examples/tree1024.py

+#!/usr/bin/python
+
+"""
+Create a 1024-host network, and run the CLI on it.
+If this fails because of kernel limits, you may have
+to adjust them, e.g. by adding entries to /etc/sysctl.conf
+and running sysctl -p. Check util/sysctl_addon.
+"""
+
+from mininet.cli import CLI
+from mininet.log import setLogLevel
+from mininet.net import init, Mininet
+from mininet.node import KernelSwitch
+from mininet.topolib import TreeTopo
+
+def TreeNet( depth=1, fanout=2, **kwargs ):
+    "Convenience function for creating tree networks."
+    topo = TreeTopo( depth, fanout )
+    return Mininet( topo, **kwargs )
+    
+if __name__ == '__main__':
+    setLogLevel( 'info' )
+    init()
+    KernelSwitch.setup()
+    network = TreeNet( depth=2, fanout=32, switch=KernelSwitch )
+    network.run( CLI, network )

examples/treeping64.py

+#!/usr/bin/python
+
+"Create a 64-node tree network, and test connectivity using ping."
+   
+from mininet.cli import CLI
+from mininet.log import setLogLevel
+from mininet.net import init, Mininet
+from mininet.node import KernelSwitch, UserSwitch, OVSKernelSwitch
+from mininet.topolib import TreeTopo
+
+def TreeNet( depth=1, fanout=2, **kwargs ):
+    "Convenience function for creating tree networks."
+    topo = TreeTopo( depth, fanout )
+    return Mininet( topo, **kwargs )
+    
+def treePing64():
+    results = {}
+    switches = { 'reference kernel': KernelSwitch,
+        'reference user': UserSwitch,
+        'Open vSwitch kernel': OVSKernelSwitch }
+
+    for name in switches.keys():
+        print "*** Testing", name, "datapath"
+        switch = switches[ name ]
+        network = TreeNet( depth=2, fanout=8, switch=switch )
+        result = network.run( network.pingAll )
+        results[ name ] = result
+
+    print  
+    print "*** Tree network ping results:"
+    for name in switches.keys():
+        print "%s: %d%% packet loss" % ( name, results[ name ] )
+    print
+   
+if __name__ == '__main__':
+   setLogLevel( 'info' )
+   init()
+   treePing64()
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