TCP BBR

From ChatGPT with some prompting
Overview of TCP BBR:

• TCP BBR optimizes network performance using Bottleneck Bandwidth and Round-trip time (RTT).
• Speed is determined by RTT.
• Bandwidth is determined by Bottleneck Bandwidth.

Learning Process:

• Every ACK:
  • Updates the bottleneck bandwidth.
  • Tracks the minimum observed RTT value.
• Every RTT:
  • Adjusts the sending size (n * MSS) and the pacing rate (the rate at which data is sent).

Sending Size Update:

• BBR continuously updates the sending size (how many MSS to send) based on the current network conditions.

In summary, TCP BBR learns the network conditions by monitoring the bottleneck bandwidth and RTT, and accordingly adjusts the sending size and pacing rate to optimize data transmission, reducing congestion and improving performance.