RE: [pilc] Re: BCP 69, RFC 3449 on TCP Performance Implications of Network Path Asymmetry

From: Spencer Dawkins (sdawkins@cynetanetworks.com)
Date: Fri Dec 20 2002 - 10:03:38 EST

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    Yes, just to echo Aaron's congratulatons - thanks for your hard work and diligence.

    And now, to LINK ...

    Spencer

    > -----Original Message-----
    > From: Aaron Falk [mailto:falk@isi.edu]
    > Sent: Thursday, December 19, 2002 7:53 PM
    > To: PILC IETF working group; Gorry Fairhurst; mahesh@erg.abdn.ac.uk;
    > padmanab@microsoft.com; hari@lcs.mit.edu
    > Subject: [pilc] Re: BCP 69, RFC 3449 on TCP Performance
    > Implications of
    > Network Path Asymmetry
    >
    >
    > Congratulations Hari, Venkata, Gorry, and Mahesh! Another pilc
    > milestone accomplished. Thanks to the working group for your help in
    > crafting and reviewing this doc.
    >
    > Again many thanks,
    >
    > --aaron
    >
    >
    > rfc-editor@rfc-editor.org wrote:
    > >
    > > A new Request for Comments is now available in online RFC libraries.
    > >
    > >
    > > BCP 69
    > > RFC 3449
    > >
    > > Title: TCP Performance Implications of Network Path
    > > Asymmetry
    > > Author(s): H. Balakrishnan, V. Padmanabhan, G. Fairhurst,
    > > M. Sooriyabandara
    > > Status: Standards Track
    > > Date: December 2002
    > > Mailbox: hari@lcs.mit.edu, padmanab@microsoft.com,
    > > gorry@erg.abdn.ac.uk, mahesh@erg.abdn.ac.uk
    > > Pages: 41
    > > Characters: 108839
    > > See Also: BCP 69
    > >
    > > I-D Tag: draft-ietf-pilc-asym-08.txt
    > >
    > > URL: ftp://ftp.rfc-editor.org/in-notes/rfc3449.txt
    > >
    > >
    > > This document describes TCP performance problems that arise
    > because of
    > > asymmetric effects. These problems arise in several access
    > networks,
    > > including bandwidth-asymmetric networks and packet radio
    > subnetworks,
    > > for different underlying reasons. However, the end result on TCP
    > > performance is the same in both cases: performance often degrades
    > > significantly because of imperfection and variability in the ACK
    > > feedback from the receiver to the sender.
    > >
    > > The document details several mitigations to these effects,
    > which have
    > > either been proposed or evaluated in the literature, or are
    > currently
    > > deployed in networks. These solutions use a combination of local
    > > link-layer techniques, subnetwork, and end-to-end mechanisms,
    > > consisting of: (i) techniques to manage the channel used for the
    > > upstream bottleneck link carrying the ACKs, typically using header
    > > compression or reducing the frequency of TCP ACKs, (ii)
    > techniques to
    > > handle this reduced ACK frequency to retain the TCP sender's
    > > acknowledgment-triggered self-clocking and (iii) techniques to
    > > schedule the data and ACK packets in the reverse direction
    > to improve
    > > performance in the presence of two-way traffic. Each technique is
    > > described, together with known issues, and recommendations
    > for use. A
    > > summary of the recommendations is provided at the end of
    > the document.
    > >
    > > This document is a product of the Performance Implications of Link
    > > Characteristics Working Group of the IETF.
    > >
    > > This document specifies an Internet Best Current Practices for the
    > > Internet Community, and requests discussion and suggestions for
    > > improvements. Distribution of this memo is unlimited.
    > >
    >
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    >
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