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Versions: 00 draft-touch-tcpm-2140bis

TCP Maintenance and Minor Extensions (tcpm)                     M. Welzl
Internet-Draft                                                  S. Islam
Intended status: Informational                        University of Oslo
Expires: April 21, 2016                                         J. Touch
                                                                 USC/ISI
                                                                  J. You
                                                                  Huawei
                                                        October 19, 2015


    The state of implementation of TCP control block interdependence
                    draft-welzl-tcpm-tcb-sharing-00

Abstract

   This document provides an overview of the state of implementation of
   RFC 2140, in preparation for a possible future RFC2140bis document.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on April 21, 2016.

Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of




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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  State of Implementation . . . . . . . . . . . . . . . . . . .   2
   2.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   3.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   4

1.  State of Implementation

   * L = Linux, F = FreeBSD

    Table 1: State of implementation of RFC 2140 in Linux and FreeBSD
   +----------+-------------+------------------+-----------------------+
   | RFC 2140 | Description | Implementation   | Status                |
   +----------+-------------+------------------+-----------------------+
   | Old-MSS  | Maximum     | F:rmx_mtu        | This is being cached  |
   |          | Segment     |                  | and shared in         |
   |          | Size        |                  | FreeBSD.              |
   +----------+-------------+------------------+-----------------------+
   | Old-RTT  | Estimated   | L:TCP_METRIC_RTT | Cached in both        |
   |          | Round-Trip  | F:rmx_rtt        | FreeBSD and Linux,    |
   |          | Time        |                  | however it is being   |
   |          |             |                  | used by a new         |
   |          |             |                  | connection in FreeBSD |
   |          |             |                  | only.                 |
   +----------+-------------+------------------+-----------------------+
   | Old-RTT  | Estimated   | L:TCP_METRIC_    | Cached in both        |
   | var      | Round-Trip  | RTTVAR           | FreeBSD and Linux,    |
   |          | Time        | F:rmx_rttvar     | however it is being   |
   |          |             |                  | used by a new         |
   |          |             |                  | connection in FreeBSD |
   |          |             |                  | only.                 |
   +----------+-------------+------------------+-----------------------+
   | Old-snd_ | Congestion  | L:TCP_METRIC_    | Cached in both        |
   | cwnd     | Window      | CWND             | FreeBSD and Linux,    |
   |          |             | F:rmx_cwnd       | however it is not     |
   |          |             |                  | being used by a new   |
   |          |             |                  | connection.           |
   +----------+-------------+------------------+-----------------------+
   | -        | Slow Start  | L:TCP_METRIC_    | This is being cached  |
   |          | Thresold    | SSTHRESH         | and shared in both    |
   |          |             | F:rmx_ssthresh   | FreeBSD and Linux. In |
   |          |             |                  | Linux,  it is set to  |
   |          |             |                  | max(cwnd/2, ssthresh) |
   |          |             |                  | in most cases. In     |



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   |          |             |                  | FreeBSD, however, it  |
   |          |             |                  | is set to either the  |
   |          |             |                  | current ssthresh if   |
   |          |             |                  | not set previously,   |
   |          |             |                  | or to the arithmetic  |
   |          |             |                  | ssthresh and          |
   |          |             |                  | previously cached     |
   |          |             |                  | metric.               |
   +----------+-------------+------------------+-----------------------+
   | -        | Metric      | L:TCP_METRIC_    | This is being cached  |
   |          | related to  | REORDERING       | and shared in Linux.  |
   |          | the extent  |                  |                       |
   |          | of          |                  |                       |
   |          | reordering. |                  |                       |
   +----------+-------------+------------------+-----------------------+
   | -        | Estimated   | F:rmx_bandwidth  | Not in the            |
   |          | Bandwidth   |                  | specification. It is  |
   |          |             |                  | not set before        |
   |          |             |                  | caching when a        |
   |          |             |                  | connection is closed. |
   +----------+-------------+------------------+-----------------------+
   | -        | Outbound    | F:rmx_sendpipe   | Not in the            |
   |          | Delay -     |                  | specification. This   |
   |          | Bandwidth   |                  | is used for socket    |
   |          | Product     |                  | buffer in FreeBSD.    |
   |          |             |                  | The value is set to 0 |
   |          |             |                  | before caching when a |
   |          |             |                  | connection is closed. |
   +----------+-------------+------------------+-----------------------+
   | -        | Inbound     | F:rmx_recvpipe   | Not in the            |
   |          | Delay-      |                  | specification. This   |
   |          | Bandwidth   |                  | is used for socket    |
   |          | Product     |                  | buffer in FreeBSD.    |
   |          |             |                  | The value is set to 0 |
   |          |             |                  | before caching when a |
   |          |             |                  | connection is closed. |
   +----------+-------------+------------------+-----------------------+

2.  IANA Considerations

   This memo includes no request to IANA.

3.  Security Considerations

   To be added






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Authors' Addresses

   Michael Welzl
   University of Oslo
   PO Box 1080 Blindern
   Oslo  N-0316
   Norway

   Phone: +47 22 85 24 20
   Email: michawe@ifi.uio.no


   Safiqul Islam
   University of Oslo
   PO Box 1080 Blindern
   Oslo  N-0316
   Norway

   Phone: +47 22 84 08 37
   Email: safiquli@ifi.uio.no


   Joe Touch
   USC/ISI
   4676 Admiralty Way, Marina del Rey
   CA  90292-6695
   USA

   Phone: +1 (310) 448-9151
   Email: touch@isi.edu


   Jianjie You
   Huawei
   101 Software Avenue, Yuhua District
   Nanjing  210012
   China

   Email: youjianjie@huawei.com












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