Date: Thu, 09 Jan 2020 22:19:44 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 243234] TCP/ECN - RTO retransmissions sent without CWR flag in newreno and cubic Message-ID: <bug-243234-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243234 Bug ID: 243234 Summary: TCP/ECN - RTO retransmissions sent without CWR flag in newreno and cubic Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: rscheff@gmx.at While investigating performance implications of RTO on ECN-enabled TCP flows, it was noted that the recovery from a lost retransmission - using the RTO timeout - is sent without the CWR flag in the TCP header (but the IP ECT codepoint is cleared). Linux has a similar misbehavior, but there it appears that someone tied the signaling of TCP ECN header flags to the setting of the IP header ECT codepoints - which is not correct though. dctcp has explicit code in its _cong_signal handler, to mark the RTO retransmission explicitly with the CWR flag. -- You are receiving this mail because: You are the assignee for the bug.help
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