cnp3-ebook

protocols/congestion

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TCP's congestion control scheme is based on a `congestion window`. The current value of the congestion window (`cwnd`) is stored in the TCB of each TCP connection and the window that can be used by the sender is constrained by :math:`\min(cwnd,rwin,swin)` where :math:`swin` is the current sending window and :math:`rwin` the last received receive window. The `Additive Increase` part of the TCP congestion control increments the congestion window by :term:`MSS` bytes every round-trip-time. In the TCP literature, this phase is often called the `congestion avoidance` phase. The `Multiplicative Decrease` part of the TCP congestion control divides the current value of the congestion window once congestion has been detected.

4 years ago

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