K 10
svn:author
V 7
rscheff
K 8
svn:date
V 27
2020-08-13T16:45:55.265973Z
K 7
svn:log
V 710
TCP Cubic: Have Fast Convergence Heuristic work for ECN, and align concave region

The Cubic concave region was not aligned nicely for the very first exit from
slow start, where a 50% cwnd reduction is done instead of the normal 30%.

This addresses an issue, where a short line-rate burst could result from that
sudden jump of cwnd.

In addition, the Fast Convergence Heuristic has been expanded to work also
with ECN induced congestion response.

Submitted by:	chengc_netapp.com
Reported by:	chengc_netapp.com
Reviewed by:	tuexen (mentor), rgrimes (mentor)
Approved by:	tuexen (mentor), rgrimes (mentor)
MFC after:	3 weeks
Sponsored by:	NetApp, Inc.
Differential Revision:	https://reviews.freebsd.org/D25976

END