Unit Instance

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        "When a TCP connection begins, the sending host does not know whether the part of the network that it uses to reach the destination is congested or not. To avoid causing too much congestion, it must start with a small congestion window. [Jacobson1988]_ recommends an initial window of MSS bytes. As the additive increase part of the TCP congestion control scheme increments the congestion window by MSS bytes every round-trip-time, the TCP connection may have to wait many round-trip-times before being able to efficiently use the available bandwidth. This is especially important in environments where the :math:`bandwidth \\times rtt` product is high. To avoid waiting too many round-trip-times before reaching a congestion window that is large enough to efficiently utilize the network, the TCP congestion control scheme includes the `slow-start` algorithm. The objective of the TCP `slow-start` phase is to quickly reach an acceptable value for the `cwnd`. During `slow-start`, the congestion window is doubled every round-trip-time. The `slow-start` algorithm uses an additional variable in the TCB : `ssthresh` (`slow-start threshold`). The `ssthresh` is an estimation of the last value of the `cwnd` that did not cause congestion. It is initialized at the sending window and is updated after each congestion event."
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        "When a TCP connection begins, the sending host does not know whether the part of the network that it uses to reach the destination is congested or not. To avoid causing too much congestion, it must start with a small congestion window. [Jacobson1988]_ recommends an initial window of MSS bytes. As the additive increase part of the TCP congestion control scheme increments the congestion window by MSS bytes every round-trip-time, the TCP connection may have to wait many round-trip-times before being able to efficiently use the available bandwidth. This is especially important in environments where the :math:`bandwidth \\times rtt` product is high. To avoid waiting too many round-trip-times before reaching a congestion window that is large enough to efficiently utilize the network, the TCP congestion control scheme includes the `slow-start` algorithm. The objective of the TCP `slow-start` phase is to quickly reach an acceptable value for the `cwnd`. During `slow-start`, the congestion window is doubled every round-trip-time. The `slow-start` algorithm uses an additional variable in the TCB : `ssthresh` (`slow-start threshold`). The `ssthresh` is an estimation of the last value of the `cwnd` that did not cause congestion. It is initialized at the sending window and is updated after each congestion event."
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