netdev - Re: [PATCH net-next 0/2] tcp_bbr: Improving TCP BBR performance for WiFi and cellular networks

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Date:   Thu, 24 Jan 2019 22:27:43 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     priyarjha@...gle.com
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net-next 0/2] tcp_bbr: Improving TCP BBR performance
 for WiFi and cellular networks

From: Priyaranjan Jha <priyarjha@...gle.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!