In network.py function  getInterfaceSpeed() only read the first line of ethtool's output, so it is impossible to get the correct speed. 

At least, 3 lines need to be modified:
    def getInterfaceSpeed(self):
        # default to 100 Mb/s
        self.interfaceSpeed = 0
        for interfaceString in (self.interface, "p%s" % self.interface):
            ethtoolCommand = "ethtool %s" % interfaceString
            pipe = os.popen(ethtoolCommand)
#            line = pipe.readline()       
            line=pipe.read()                    # use method read() to get the whole output
            pipe.close()
            if line:
#                pattern = re.compile("Speed: \d+Mb/s")
                pattern = re.compile("(Speed: )(?P<speed>\d+)(Mb/s)")  # use re to match the speed
                match = pattern.search(line)
                if match:
#                    self.interfaceSpeed = string.atoi(match.group())
                    self.interfaceSpeed = string.atoi(match.group("speed"))  # transfer speed to type int
                    break
        if self.interfaceSpeed == 0:
            # default it to 100
            self.interfaceSpeed = 100
            return False

        sys.stdout.flush()
        return True