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is a completely separate TCP stack (tcp_bbr.ko) that will be built only if you add the make options WITH_EXTRA_TCP_STACKS=1 and also include the option TCPHPTS. You can also include the RATELIMIT option if you have a NIC interface that supports hardware pacing, BBR understands how to use such a feature. Note that this commit also adds in a general purpose time-filter which allows you to have a min-filter or max-filter. A filter allows you to have a low (or high) value for some period of time and degrade slowly to another value has time passes. You can find out the details of BBR by looking at the original paper at: https://queue.acm.org/detail.cfm?id=3022184 or consult many other web resources you can find on the web referenced by "BBR congestion control". It should be noted that BBRv1 (which this is) does tend to unfairness in cases of small buffered paths, and it will usually get less bandwidth in the case of large BDP paths(when competing with new-reno or cubic flows). BBR is still an active research area and we do plan on implementing V2 of BBR to see if it is an improvement over V1. Sponsored by: Netflix Inc. Differential Revision: https://reviews.freebsd.org/D21582 |
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