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Differential D50891

tcp: provide sysctl for the maximum retransmission timeout
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Authored by glebius on Jun 16 2025, 11:52 PM.

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rG552d17804629: tcp: provide sysctl for the maximum retransmission timeout

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rG FreeBSD src repository

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Buildable 64925
Build 61808: arc lint + arc unit

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glebius created this revision.Jun 16 2025, 11:52 PM

Herald added 1 blocking reviewer(s): transport. · View Herald TranscriptJun 16 2025, 11:52 PM

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

glebius requested review of this revision.Jun 16 2025, 11:52 PM

Harbormaster completed remote builds in B64925: Diff 157150.Jun 16 2025, 11:52 PM

glebius added a parent revision: D50890: tcp: remove CTLFLAG_NEEDGIANT from sysctl(9) handlers related to timers.Jun 16 2025, 11:52 PM

glebius added a child revision: D50892: snmp_mibII: use sysctl(3) to read min/max TCP retransmission timeouts.

You might also want to

describe rexmit_max in the entry describing rexmit_initial, rexmit_min, and rexmit_slop in share/man/man4/tcp.4.
use tcp_rexmit_max instead of TCPTV_REXMTMAX in sys/netinet/tcp_stacks/bbr.c.
use tcp_rexmit_max instead of TCPTV_REXMTMAX in sys/netinet/tcp_stacks/rack.c.

Don't forget rack/bbr.
Document the new sysctl and improve paragraph.

Herald added a subscriber: ziaee. · View Herald TranscriptJun 17 2025, 4:35 AM

Harbormaster completed remote builds in B64933: Diff 157162.Jun 17 2025, 4:35 AM

tuexen accepted this revision.Jun 17 2025, 6:42 AM

This revision is now accepted and ready to land.Jun 17 2025, 6:42 AM

Closed by commit rG552d17804629: tcp: provide sysctl for the maximum retransmission timeout (authored by glebius). · Explain WhyJun 19 2025, 3:29 AM

This revision was automatically updated to reflect the committed changes.

glebius added a commit: rG552d17804629: tcp: provide sysctl for the maximum retransmission timeout.

Revision Contents
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sys/

netinet/

4 lines

4 lines

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8 lines

Diff 157150

sys/netinet/tcp_input.c

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sys/netinet/tcp_subr.c

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sys/netinet/tcp_syncache.c

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sys/netinet/tcp_timer.h

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sys/netinet/tcp_timer.c

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