Internet DRAFT - draft-welzl-tcpm-tcb-sharing
draft-welzl-tcpm-tcb-sharing
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
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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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