Beginner needs help.

[Sadjida Lebid]

hello, I'm newly studying bbr and how does it work,

I want to know what formula it uses to calculate the congestion window,

and what's the difference between the cwnd and the pacing rate, are they related to each other ?

[Neal Cardwell]

Hi,

For the question about the cwnd and pacing rate, please consult the original intro piece:

    https://cacm.acm.org/magazines/2017/2/212428-bbr-congestion-based-congestion-control/pdf

For the question about how BBRv1 calculates the cwnd, please consult the code, e.g. bbr_set_cwnd() in this code:

  https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/tree/net/ipv4/tcp_bbr.c

For BBRv2 cwnd computations, please see the "Congestion Window" section of the IETF draft:

  https://datatracker.ietf.org/doc/html/draft-cardwell-iccrg-bbr-congestion-control#section-4.6.4

Hope that helps!

Best regards,

neal

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