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   o  M is the fraction of sent bytes that encountered congestion during
      the previous observation window, where the observation window is
      chosen to be approximately the Round Trip Time (RTT).

   1.  Compute the bytes acknowledged: 
          BytesAcked = SEG.ACK - SND.UNA

   The switch indicates congestion to the end nodes by setting the CE
   codepoint in the IP header as specified in Section 5 of [RFC3168].
   For example, the switch may be configured with a congestion
   threshold.  When a packet arrives at the switch and its queue length
   is greater than the congestion threshold, the switch sets the CE
   codepoint in the packet.  However, the actual algorithm for marking
   congestion is an implementation detail of the switch and will
   generally not be known to the sender and receiver.