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
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=359422
@ -34,7 +34,7 @@
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.\" From: @(#)tcp.4 8.1 (Berkeley) 6/5/93
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.\" $FreeBSD$
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.\"
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.Dd December 2, 2019
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.Dd March 29, 2020
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.Dt TCP 4
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.Os
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.Sh NAME
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@ -632,7 +632,12 @@ Turn on automatic path MTU blackhole detection.
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In case of retransmits OS will
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lower the MSS to check if it's MTU problem.
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If current MSS is greater than
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configured value to try, it will be set to configured value, otherwise,
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configured value to try
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.Po Va net.inet.tcp.pmtud_blackhole_mss
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and
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.Va net.inet.tcp.v6pmtud_blackhole_mss
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.Pc ,
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it will be set to this value, otherwise,
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MSS will be set to default values
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.Po Va net.inet.tcp.mssdflt
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and
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@ -642,13 +647,6 @@ and
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MSS to try for IPv4 if PMTU blackhole detection is turned on.
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.It Va v6pmtud_blackhole_mss
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MSS to try for IPv6 if PMTU blackhole detection is turned on.
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.It Va pmtud_blackhole_activated
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Number of times configured values were used in an attempt to downshift.
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.It Va pmtud_blackhole_activated_min_mss
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Number of times default MSS was used in an attempt to downshift.
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.It Va pmtud_blackhole_failed
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Number of connections for which retransmits continued even after MSS
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downshift.
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.It Va functions_available
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List of available TCP function blocks (TCP stacks).
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.It Va functions_default
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