From: Priyaranjan Jha <priyarjha.kernel@gmail.com>
To: David Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org, gregkh@linuxfoundation.org,
Priyaranjan Jha <priyarjha@google.com>
Subject: [PATCH linux-4.19.y 0/2] tcp_bbr: Improving TCP BBR performance for WiFi and cellular networks
Date: Tue, 22 Sep 2020 12:27:33 -0700 [thread overview]
Message-ID: <20200922192735.3976618-1-priyarjha.kernel@gmail.com> (raw)
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(-)
--
2.28.0.681.g6f77f65b4e-goog
next reply other threads:[~2020-09-22 19:28 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-22 19:27 Priyaranjan Jha [this message]
2020-09-22 19:27 ` [PATCH linux-4.19.y 1/2] tcp_bbr: refactor bbr_target_cwnd() for general inflight provisioning Priyaranjan Jha
2020-09-22 19:27 ` [PATCH linux-4.19.y 2/2] tcp_bbr: adapt cwnd based on ack aggregation estimation Priyaranjan Jha
2020-09-25 10:57 ` [PATCH linux-4.19.y 0/2] tcp_bbr: Improving TCP BBR performance for WiFi and cellular networks Greg KH
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