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From: Greg KH <gregkh@linuxfoundation.org>
To: Priyaranjan Jha <priyarjha.kernel@gmail.com>
Cc: David Miller <davem@davemloft.net>,
	netdev@vger.kernel.org, Priyaranjan Jha <priyarjha@google.com>
Subject: Re: [PATCH linux-4.19.y 0/2] tcp_bbr: Improving TCP BBR performance for WiFi and cellular networks
Date: Fri, 25 Sep 2020 12:57:29 +0200	[thread overview]
Message-ID: <20200925105729.GA2573626@kroah.com> (raw)
In-Reply-To: <20200922192735.3976618-1-priyarjha.kernel@gmail.com>

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

      parent reply	other threads:[~2020-09-25 10:57 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-22 19:27 [PATCH linux-4.19.y 0/2] tcp_bbr: Improving TCP BBR performance for WiFi and cellular networks Priyaranjan Jha
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 ` Greg KH [this message]

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