approval for D28780 / 853fd7a2e39802e46bd3d6476529796ac22412d9

[Scheffenegger, Richard]

Hi Glen,

I received feedback around PRR which shows up as a performance degradation.

I would like to MFC this commit in about one week into STABLE/13, and ideally to releng/13.0 around the same time (or should there be at least 3 days linger time in STABLE, after one week in HEAD)?

https://reviews.freebsd.org/D28780


Under some circumstances, PRR may end up with a fully
collapsed cwnd when finalizing the loss recovery.

Also, in case PRR is working against an empty scoreboard,
a possibilty for an integer overflow exists. Performing
signed arithmetics to address a possible sudden jump of cwnd.



Richard Scheffenegger