Differential D40424

tcp: make the maximum number of retransmissions tunable per VNET
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Authored by rscheff on Jun 5 2023, 5:51 PM.

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cc
rrs
jtl
tuexen
glebius

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rG43b117f88f30: tcp: make the maximum number of retransmissions tunable per VNET

Summary

With Windows (TcpMaxDataRetransmissions) and Linux (tcp_retries2)
there is precedent that sometimes it is useful to restrict the
maximum number of retransmissions sent - as each of these will
be sent after an exponentially increasing interval.

This adds that same capability on a per-VNet basis to FreeBSD.

Diff Detail

Repository

rG FreeBSD src repository

Lint

Lint Passed

Unit

No Test Coverage

Build Status

Buildable 51907
Build 48798: arc lint + arc unit

Event Timeline

rscheff created this revision.Jun 5 2023, 5:51 PM

Herald added a reviewer: transport. · View Herald TranscriptJun 5 2023, 5:51 PM

Herald added subscribers: melifaro, imp. · View Herald Transcript

rscheff requested review of this revision.Jun 5 2023, 5:51 PM

Harbormaster completed remote builds in B51907: Diff 122856.Jun 5 2023, 5:51 PM

tuexen added inline comments.Jun 5 2023, 7:14 PM

sys/netinet/tcp_timer.c
225	Maybe something like "maximum number of consecutive timer based retransmissions"?
519	What happens if the sysctl variable is changed during the existence of a TCP connection?

deal with V_tcp_retries reduced while in a RTO sequence

Harbormaster completed remote builds in B51910: Diff 122865.Jun 5 2023, 8:39 PM

better short description

Harbormaster completed remote builds in B51911: Diff 122866.Jun 5 2023, 8:43 PM

rscheff marked an inline comment as done.Jun 5 2023, 8:43 PM

cc added inline comments.Jun 5 2023, 9:24 PM

share/man/man4/tcp.4
37	Back to the future? Shall be Jun?
sys/netinet/tcp_timer.c
225	Maybe something like "maximum number of consecutive timer based retransmissions"? +1

man date proper month

Harbormaster completed remote builds in B51919: Diff 122876.Jun 6 2023, 8:20 AM

rscheff marked 2 inline comments as done.Jun 6 2023, 8:21 AM

cc accepted this revision as: cc.Jun 6 2023, 12:24 PM

cc added inline comments.

sys/netinet/tcp_timer.c
227	Remove this extra empty line. And I am OK with the rest of the change.

fix whitespace

Harbormaster completed remote builds in B51929: Diff 122893.Jun 6 2023, 1:08 PM

tuexen accepted this revision.Jun 6 2023, 8:17 PM

This revision is now accepted and ready to land.Jun 6 2023, 8:17 PM

rscheff closed this revision.Jun 6 2023, 9:58 PM

rscheff added a commit: rG43b117f88f30: tcp: make the maximum number of retransmissions tunable per VNET.

Revision Contents
Changeset List

Path

Size

share/

man/

man4/

5 lines

sys/

netinet/

2 lines

tcp_stacks/

8 lines

8 lines

32 lines

2 lines

Diff 122856

share/man/man4/tcp.4

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sys/netinet/tcp_output.c

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sys/netinet/tcp_stacks/bbr.c

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sys/netinet/tcp_stacks/rack.c

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sys/netinet/tcp_timer.c

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sys/netinet/tcp_var.h

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