| Message ID | 20200922192735.3976618-1-priyarjha.kernel@gmail.com |
|---|---|
| Headers | show |
| Series | tcp_bbr: Improving TCP BBR performance for WiFi and cellular networks | expand |
On Tue, Sep 22, 2020 at 12:27:33PM -0700, Priyaranjan Jha wrote: > From: Priyaranjan Jha <priyarjha@google.com> > > 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. Both now queued up, thanks. greg k-h
From: Priyaranjan Jha <priyarjha@google.com> 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. Priyaranjan Jha (2): tcp_bbr: refactor bbr_target_cwnd() for general inflight provisioning tcp_bbr: adapt cwnd based on ack aggregation estimation include/net/inet_connection_sock.h | 4 +- net/ipv4/tcp_bbr.c | 180 +++++++++++++++++++++++++---- 2 files changed, 161 insertions(+), 23 deletions(-)