Subject: [tcpm] Fwd: I-D Action: draft-ietf-tcpm-proportional-rate-reduction-01.txt

From: Pasi Sarolahti <[email-masked]>
Date: Thu, 8 Mar 2012 15:28:52 +0200

Hi,

The authors of the Proportional Rate Reduction draft think the draft starts to be ready. There hasn't been much mailing list traffic on this in the recent months apart from I-D announcements, so now -- 3 weeks before the meeting -- would be a great time to read the current version of the draft and send comments to the list.

Thanks!

- Pasi

Begin forwarded message:

> From: <[email-masked]>
> Subject: [tcpm] I-D Action: draft-ietf-tcpm-proportional-rate-reduction-01.txt
> Date: February 25, 2012 12:19:55 AM GMT+02:00
> To: <[email-masked]>
> Cc: <[email-masked]>
> 
> 
> A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the TCP Maintenance and Minor Extensions Working Group of the IETF.
> 
> 	Title           : Proportional Rate Reduction for TCP
> 	Author(s)       : Matt Mathis
>                          Nandita Dukkipati
>                          Yuchung Cheng
> 	Filename        : draft-ietf-tcpm-proportional-rate-reduction-01.txt
> 	Pages           : 16
> 	Date            : 2012-02-24
> 
>   This document describes an experimental algorithm, Proportional Rate
>   Reduction (PPR) to improve the accuracy of the amount of data sent by
>   TCP during loss recovery.  Standard Congestion Control requires that
>   TCP and other protocols reduce their congestion window in response to
>   losses.  This window reduction naturally occurs in the same round
>   trip as the data retransmissions to repair the losses, and is
>   implemented by choosing not to transmit any data in response to some
>   ACKs arriving from the receiver.  Two widely deployed algorithms are
>   used to implement this window reduction: Fast Recovery and Rate
>   Halving.  Both algorithms are needlessly fragile under a number of
>   conditions, particularly when there is a burst of losses that such
>   that the number of ACKs returning to the sender is small.
>   Proportional Rate Reduction minimizes these excess window reductions
>   such that at the end of recovery the actual window size will be as
>   close as possible to ssthresh, the window size determined by the
>   congestion control algorithm.  It is patterned after Rate Halving,
>   but using the fraction that is appropriate for target window chosen
>   by the congestion control algorithm.
> 
> 
> A URL for this Internet-Draft is:
> http://www.ietf.org/internet-drafts/draft-ietf-tcpm-proportional-rate-reduction-01.txt
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
> 
> This Internet-Draft can be retrieved at:
> ftp://ftp.ietf.org/internet-drafts/draft-ietf-tcpm-proportional-rate-reduction-01.txt
> 
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