Cubic changes for improved loss recovery.
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Authored by hiren on Oct 14 2016, 6:49 PM.

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rrs
lstewart

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transport

Summary

always update t_last_cong on loss and generally treat first loss as valid
restore old t_last_cong on bad retransmit and generally undo first loss if not valid
add fast convergence (see 3.6 in RFC)
scale ssthresh by cubic beta rather than 0.5, per RFC (same as Linux)

Submitted by: Matt Macy
Sponsored by: Limelight Networks

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Buildable 5610
Build 5875: arc lint + arc unit

hiren retitled this revision from to Cubic changes for improved loss recovery..

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sys/netinet/cc/cc_cubic.c
444	need a typecast to (uint64_t) here for very large cwnd
474	Why introduce CUBIC_SCALE for a single use here, instead of (1<<CUBIC_SCALE)? Also, this code doesn't seem to match the comment?