e763f31429
is acceptable in the congestion avoidance phase, but not during slow start. The MTU is is also not taken into account. Use a method instead, which is based on exponential growth working also in slow start and being independent from the MTU. This is joint work with rrs@. Reviewed by: rrs@, Richard Scheffenegger Sponsored by: Netflix, Inc. Differential Revision: https://reviews.freebsd.org/D18375