From: "Kevin(Yudong) Yang" <y...@google.com>
Date: Thu, 26 Sep 2019 10:30:05 -0400
> There was a bug in the previous logic that attempted to ensure gain cycling
> gets inflight above BDP even for small BDPs. This code correctly raised and
> lowered target inflight values during the gain cycle. And this code
> correctly ensured that cwnd was raised when probing bandwidth. However, it
> did not correspondingly ensure that cwnd was *not* raised in this way when
> *not* probing for bandwidth. The result was that small-BDP flows that were
> always cwnd-bound could go for many cycles with a fixed cwnd, and not probe
> or yield bandwidth at all. This meant that multiple small-BDP flows could
> fail to converge in their bandwidth allocations.
>
> Fixes: 383d470 ("tcp_bbr: fix bw probing to raise in-flight data for very
> small BDPs")
Always use 12 digits of significance for SHA1 IDs, there are already 6 digit
conflicts.
> Signed-off-by: Kevin(Yudong) Yang <y...@google.com>
> Acked-by: Neal Cardwell <ncardw...@google.com>
> Acked-by: Yuchung Cheng <ych...@google.com>
> Acked-by: Soheil Hassas Yeganeh <soh...@google.com>
> Acked-by: Priyaranjan Jha <priyar...@google.com>
Applied and queued up for -stable.
