netdev - Re: [PATCH 1/1] TCP NewCWV for Linux

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Date:	Thu, 20 Feb 2014 16:10:15 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	raffaello@....abdn.ac.uk
Cc:	netdev@...r.kernel.org, ziaul.hossain@...n.ac.uk,
	gorry@....abdn.ac.uk
Subject: Re: [PATCH 1/1] TCP NewCWV for Linux

From: raffaello@....abdn.ac.uk
Date: Thu, 20 Feb 2014 19:28:56 -0000

> This is a patch for newcwv a TCP sender-side modification,
> currently a work item at TCPM (TCP Maintenance and Minor extensions)
> at the IETF:
> 
> http://tools.ietf.org/search/draft-ietf-tcpm-newcwv-05
> 
> newcwv aims to supersede CWV (RFC2861) to provide better
> congestion control for rate-limited applications that use TCP.
> 
> We implemented it as a module that uses tcp_congestion_ops.
> The main changes are in "cong_avoid" before Reno cwnd control
> and at the start and end of Fast Retransmit:
> 
> 1) Before Reno algorithm we estimate at each ACK our pipeACK
> (update_pipeack) and decide to increase or not cwnd based on pipeack.
> 
> 2) At the start of FR we reset cwnd based on pipeACK, while
> at the end we further reduce pipeACK by the number of retransmissions.
> 
> I posted it here for you consideration to be included in net-next.

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