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: b...@freebsd.org
Reporter: rsch...@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.
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