TCP Congestion Control
The sender maintains a congestion window: slow start doubles it every RTT until loss or a threshold, then growth turns cautious and loss cuts it back. Linux's default CUBIC regrows the window along a cubic curve toward the last loss point, while BBR instead measures delivery rate and RTT to pace at the estimated bottleneck bandwidth without needing loss as a signal.
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The sender maintains a congestion window: slow start doubles it every RTT until loss or a threshold, then growth turns cautious and loss cuts it back. Linux's default CUBIC regrows the window along a cubic curve toward the last loss point, while BBR instead measures delivery rate and RTT to pace at the estimated bottleneck bandwidth without needing loss as a signal.
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