From 65c5bff38713cf280d944619677fbfadf29409fa Mon Sep 17 00:00:00 2001 From: Michael Tuexen Date: Sun, 29 Mar 2020 15:43:00 +0000 Subject: [PATCH] Be a bit more precisly in the description of the sysctl variable net.inet.tcp.pmtud_blackhole_detection. Also remove three entries, which are not sysctl variables but statistic counters for TCP. Thanks to 0mp@ for suggesting an improvement. Reviewed by: bcr@ Sponsored by: Netflix, Inc. Differential Revision: https://reviews.freebsd.org/D24216 --- share/man/man4/tcp.4 | 16 +++++++--------- 1 file changed, 7 insertions(+), 9 deletions(-) diff --git a/share/man/man4/tcp.4 b/share/man/man4/tcp.4 index b1a4e1205383..b6110068171c 100644 --- a/share/man/man4/tcp.4 +++ b/share/man/man4/tcp.4 @@ -34,7 +34,7 @@ .\" From: @(#)tcp.4 8.1 (Berkeley) 6/5/93 .\" $FreeBSD$ .\" -.Dd December 2, 2019 +.Dd March 29, 2020 .Dt TCP 4 .Os .Sh NAME @@ -632,7 +632,12 @@ Turn on automatic path MTU blackhole detection. In case of retransmits OS will lower the MSS to check if it's MTU problem. If current MSS is greater than -configured value to try, it will be set to configured value, otherwise, +configured value to try +.Po Va net.inet.tcp.pmtud_blackhole_mss +and +.Va net.inet.tcp.v6pmtud_blackhole_mss +.Pc , +it will be set to this value, otherwise, MSS will be set to default values .Po Va net.inet.tcp.mssdflt and @@ -642,13 +647,6 @@ and MSS to try for IPv4 if PMTU blackhole detection is turned on. .It Va v6pmtud_blackhole_mss MSS to try for IPv6 if PMTU blackhole detection is turned on. -.It Va pmtud_blackhole_activated -Number of times configured values were used in an attempt to downshift. -.It Va pmtud_blackhole_activated_min_mss -Number of times default MSS was used in an attempt to downshift. -.It Va pmtud_blackhole_failed -Number of connections for which retransmits continued even after MSS -downshift. .It Va functions_available List of available TCP function blocks (TCP stacks). .It Va functions_default