Re: [tcpm] I-D Action:draft-ietf-tcpm-rfc2581bis-06.txt

[Joe Touch <[e-mail]>]

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Hi, all,

[e-mail] wrote:
> 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           : TCP Congestion Control
> 	Author(s)       : M. Allman, et al.
> 	Filename        : draft-ietf-tcpm-rfc2581bis-06.txt
> 	Pages           : 17
> 	Date            : 2009-07-27
> 
> This document defines TCP's four intertwined congestion control
>  algorithms: slow start, congestion avoidance, fast retransmit, and
>  fast recovery.  In addition, the document specifies how TCP should
>  begin transmission after a relatively long idle period, as well as
>  discussing various acknowledgment generation methods.  This document
>  obsoletes RFC 2581.

FWIW, regarding the discussion of the long idle period:

The algorithm used is based on a footnote in the appendix of an
unpublished extension of Van's 1988 Sigcomm paper. Amy Hughes, John
Heidemann, and I noted this a few years ago on this list in the
following I-D:
http://www.isi.edu/touch/pubs/draft-hughes-restart-00.txt

Here is a link to the 1988 Sigcomm paper:
http://www.acm.org/pubs/articles/proceedings/comm/52324/p314-jacobson/p314-jacobson.pdf

The Sigcomm version was only 16 pages long. The word "idle" does not
appear anywhere in it.

FWIW, see also our I-D for a few ways to deal with the issue. The
problem is really that the sender is accumulating permission to burst,
which just using a timer cannot address.

Joe



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