remove User Switch from linearBandwidth due to poor performance

examples/test/test_linearbandwidth.py

@@ -21,7 +21,6 @@ class testLinearBandwidth( unittest.TestCase ):
         while True:
             index = p.expect( opts, timeout=600 )
             if index == 0:
-                previous_bw = 10 ** 10 # 10 Gbits
                 count += 1
             elif index == 1:
                 n = int( p.match.group( 1 ) )
@@ -32,12 +31,15 @@ class testLinearBandwidth( unittest.TestCase ):
                 elif unit[ 0 ] == 'M':
                     bw *= 10 ** 6
                 elif unit[ 0 ] == 'G':
-                    bw *= 10 ** 9
-                self.assertTrue( bw < previous_bw )
+                    bw *= 10 ** 9a
+                # check that we have a previous result to compare to
+                if n != 1:
+                    self.assertTrue( bw < previous_bw )
                 previous_bw = bw
             else:
                 break
 
+        # verify that we received results from at least one switch
         self.assertTrue( count > 0 )
 
 if __name__ == '__main__':