From: Priyaranjan Jha <priyar...@google.com> Date: Wed, 23 Jan 2019 12:04:52 -0800
> Ack aggregation is quite prevalent with wifi, cellular and cable modem > link tchnologies, ACK decimation in middleboxes, and common offloading > techniques such as TSO and GRO, at end hosts. Previously, BBR was often > cwnd-limited in the presence of severe ACK aggregation, which resulted in > low throughput due to insufficient data in flight. > > To achieve good throughput for wifi and other paths with aggregation, this > patch series implements an ACK aggregation estimator for BBR, which > estimates the maximum recent degree of ACK aggregation and adapts cwnd > based on it. The algorithm is further described by the following > presentation: > https://datatracker.ietf.org/meeting/101/materials/slides-101-iccrg-an-update-on-bbr-work-at-google-00 > > (1) A preparatory patch, which refactors bbr_target_cwnd for generic > inflight provisioning. > > (2) Implements BBR ack aggregation estimator and adapts cwnd based > on measured degree of ACK aggregation. Looks great. Series applied, thanks!
