This model considers a hypothetical TCP connection that suffers from equally spaced segment losses. If :math:`p` is the segment loss ratio, then the TCP connection successfully transfers :math:`\frac{1}{p}-1` segments and the next segment is lost. If we ignore the slow-start at the beginning of the connection, TCP in this environment is always in congestion avoidance as there are only isolated losses that can be recovered by using fast retransmit. The evolution of the congestion window is thus as shown in the figure below. Note that the `x-axis` of this figure represents time measured in units of one round-trip-time, which is supposed to be constant in the model, and the `y-axis` represents the size of the congestion window measured in MSS-sized segments.
This model considers a hypothetical TCP connection that suffers from equally spaced segment losses. If :math:`p` is the segment loss ratio, then the TCP connection successfully transfers :math:`\frac{1}{p}-1` segments and the next segment is lost. If we ignore the slow-start at the beginning of the connection, TCP in this environment is always in congestion avoidance as there are only isolated losses that can be recovered by using fast retransmit. The evolution of the congestion window is thus as shown in the figure below. Note that the `x-axis` of this figure represents time measured in units of one round-trip-time, which is supposed to be constant in the model, and the `y-axis` represents the size of the congestion window measured in MSS-sized segments.
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locale/pot/protocols/congestion.potwas added. 2 years ago