sys: Remove $FreeBSD$: one-line sh patternRemove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/
tcp: retire TCPDEBUGThis subsystem is superseded by modern debugging facilities,e.g. DTrace probes and TCP black box logging.We intentionally leave SO_DEBUG in place, as many utilities mayset i
tcp: retire TCPDEBUGThis subsystem is superseded by modern debugging facilities,e.g. DTrace probes and TCP black box logging.We intentionally leave SO_DEBUG in place, as many utilities mayset it on a socket. Also the tcp::debug DTrace probes look atthis flag on a socket.Reviewed by: gnn, tuexenDiscussed with: rscheff, rrs, jtlDifferential revision: https://reviews.freebsd.org/D37694
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rack/bbr: fix standalone kernel module build
This commit adds BBR (Bottleneck Bandwidth and RTT) congestion control. Thisis a completely separate TCP stack (tcp_bbr.ko) that will be built only ifyou add the make options WITH_EXTRA_TCP_STACKS=
This commit adds BBR (Bottleneck Bandwidth and RTT) congestion control. Thisis a completely separate TCP stack (tcp_bbr.ko) that will be built only ifyou add the make options WITH_EXTRA_TCP_STACKS=1 and also include the optionTCPHPTS. You can also include the RATELIMIT option if you have a NIC interface thatsupports hardware pacing, BBR understands how to use such a feature.Note that this commit also adds in a general purpose time-filter whichallows you to have a min-filter or max-filter. A filter allows you tohave a low (or high) value for some period of time and degrade slowlyto another value has time passes. You can find out the details ofBBR by looking at the original paper at:https://queue.acm.org/detail.cfm?id=3022184or consult many other web resources you can find on the webreferenced by "BBR congestion control". It should be noted thatBBRv1 (which this is) does tend to unfairness in cases of smallbuffered paths, and it will usually get less bandwidth in the caseof large BDP paths(when competing with new-reno or cubic flows). BBRis still an active research area and we do plan on implementing V2of BBR to see if it is an improvement over V1.Sponsored by: Netflix Inc.Differential Revision: https://reviews.freebsd.org/D21582