Date: Sun, 28 Dec 2014 20:56:04 +0000 (UTC) From: Sean Bruno <sbruno@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r276345 - head/share/man/man4 Message-ID: <201412282056.sBSKu4wX072680@svn.freebsd.org>
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Author: sbruno Date: Sun Dec 28 20:56:03 2014 New Revision: 276345 URL: https://svnweb.freebsd.org/changeset/base/276345 Log: Correct naming of sysctl pmtud_blackhole_activated_min_mss. Clarify some statements around PMTUD blackhole detection to make the behavior more clear in the man page. Submitted by: Mikhail <mp@lenta.ru> MFC after: 2 weeks Modified: head/share/man/man4/tcp.4 Modified: head/share/man/man4/tcp.4 ============================================================================== --- head/share/man/man4/tcp.4 Sun Dec 28 20:42:28 2014 (r276344) +++ head/share/man/man4/tcp.4 Sun Dec 28 20:56:03 2014 (r276345) @@ -521,11 +521,11 @@ This is needed to help with connection e when a broken firewall is in the network path. .It Va pmtud_blackhole_detection Turn on automatic path MTU blackhole detection. -In case of retransmits we will +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 it, otherwise, MSS will be set to -default values +configured value to try, it will be set to configured value, otherwise, +MSS will be set to default values .Po Va net.inet.tcp.mssdflt and .Va net.inet.tcp.v6mssdflt @@ -535,11 +535,12 @@ MSS to try for IPv4 if PMTU blackhole de .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 the code was activated to attempt a MSS downshift. -.It Va pmtud_blackhole_min_activated -Number of times the blackhole MSS was used in an attempt to downshift. +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 times that we failed to connect after we downshifted the MSS. +Number of connections for which retransmits continued even after MSS +downshift. .El .Sh ERRORS A socket operation may fail with one of the following errors returned:
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