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Revert r331567 CC Cubic: fix underflow for cubic_cwnd()

Description

Revert r331567 CC Cubic: fix underflow for cubic_cwnd()

This change is causing TCP connections using cubic to hang. Need to dig more to
find exact cause and fix it.

Reported by: tj at mrsk dot me, Matt Garber (via twitter)
Discussed with: sbruno (previously), allanjude, cperciva
MFC after: 3 days

Details

Committed
hirenDec 15 2018, 5:01 PM
Parents
rS342126: Remove CTM from 13-CURRENT after the release of FreeBSD-12.0.
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