continue to test cfs if rt is not enabled in kernel

examples/cpu.py

@@ -8,7 +8,7 @@ from mininet.net import Mininet
 from mininet.node import CPULimitedHost
 from mininet.topolib import TreeTopo
 from mininet.util import custom
-from mininet.log import setLogLevel, output
+from mininet.log import setLogLevel, output, info
 
 from time import sleep
 
@@ -38,7 +38,11 @@ def bwtest( cpuLimits, period_us=100000, seconds=5 ):
             host = custom( CPULimitedHost, sched=sched,
                            period_us=period_us,
                            cpu=cpu )
-            net = Mininet( topo=topo, host=host )
+            try:
+                net = Mininet( topo=topo, host=host )
+            except:
+                info( '*** Skipping host %s\n' % sched )
+                break
             net.start()
             net.pingAll()
             hosts = [ net.getNodeByName( h ) for h in topo.hosts() ]

examples/test/test_cpu.py

@@ -2,6 +2,17 @@
 
 """
 Test for cpu.py
+
+results format:
+
+    sched   cpu client MB/s
+    
+    cfs 45.00%  13254.669841
+    cfs 40.00%  11822.441399
+    cfs 30.00%  5112.963009
+    cfs 20.00%  3449.090009
+    cfs 10.00%  2271.741564
+
 """
 
 import unittest
@@ -16,8 +27,9 @@ class testCPU( unittest.TestCase ):
     def testCPU( self ):
         "Verify that CPU utilization is monotonically decreasing for each scheduler"
         p = pexpect.spawn( 'python -m mininet.examples.cpu' )
+        # matches each line from results( shown above )
         opts = [ '([a-z]+)\t([\d\.]+)%\t([\d\.]+)', 
-                 'please enable RT_GROUP_SCHED', pexpect.EOF ]
+                 pexpect.EOF ]
         scheds = []
         while True:
             index = p.expect( opts, timeout=600 )
@@ -27,11 +39,9 @@ class testCPU( unittest.TestCase ):
                 bw = float( p.match.group( 3 ) )
                 if sched not in scheds:
                     scheds.append( sched )
-                    previous_bw = 10 ** 4 # 10 GB/s
+                else:
-                self.assertTrue( bw < previous_bw )
+                    self.assertTrue( bw < previous_bw )
                 previous_bw = bw
-            elif index == 1:
-                self.skipTest( 'please enable RT_GROUP_SCHED' )
             else:
                 break