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Checking references for intended status: Informational ---------------------------------------------------------------------------- No issues found here. Summary: 1 error (**), 0 flaws (~~), 1 warning (==), 1 comment (--). Run idnits with the --verbose option for more detailed information about the items above. -------------------------------------------------------------------------------- 2 TCP Maintenance and Minor Extensions (tcpm) M. Welzl 3 Internet-Draft S. Islam 4 Intended status: Informational University of Oslo 5 Expires: April 21, 2016 J. Touch 6 USC/ISI 7 J. You 8 Huawei 9 October 19, 2015 11 The state of implementation of TCP control block interdependence 12 draft-welzl-tcpm-tcb-sharing-00 14 Abstract 16 This document provides an overview of the state of implementation of 17 RFC 2140, in preparation for a possible future RFC2140bis document. 19 Status of This Memo 21 This Internet-Draft is submitted in full conformance with the 22 provisions of BCP 78 and BCP 79. 24 Internet-Drafts are working documents of the Internet Engineering 25 Task Force (IETF). Note that other groups may also distribute 26 working documents as Internet-Drafts. The list of current Internet- 27 Drafts is at http://datatracker.ietf.org/drafts/current/. 29 Internet-Drafts are draft documents valid for a maximum of six months 30 and may be updated, replaced, or obsoleted by other documents at any 31 time. It is inappropriate to use Internet-Drafts as reference 32 material or to cite them other than as "work in progress." 34 This Internet-Draft will expire on April 21, 2016. 36 Copyright Notice 38 Copyright (c) 2015 IETF Trust and the persons identified as the 39 document authors. All rights reserved. 41 This document is subject to BCP 78 and the IETF Trust's Legal 42 Provisions Relating to IETF Documents 43 (http://trustee.ietf.org/license-info) in effect on the date of 44 publication of this document. Please review these documents 45 carefully, as they describe your rights and restrictions with respect 46 to this document. Code Components extracted from this document must 47 include Simplified BSD License text as described in Section 4.e of 48 the Trust Legal Provisions and are provided without warranty as 49 described in the Simplified BSD License. 51 Table of Contents 53 1. State of Implementation . . . . . . . . . . . . . . . . . . . 2 54 2. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3 55 3. Security Considerations . . . . . . . . . . . . . . . . . . . 3 56 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 4 58 1. State of Implementation 60 * L = Linux, F = FreeBSD 62 Table 1: State of implementation of RFC 2140 in Linux and FreeBSD 63 +----------+-------------+------------------+-----------------------+ 64 | RFC 2140 | Description | Implementation | Status | 65 +----------+-------------+------------------+-----------------------+ 66 | Old-MSS | Maximum | F:rmx_mtu | This is being cached | 67 | | Segment | | and shared in | 68 | | Size | | FreeBSD. | 69 +----------+-------------+------------------+-----------------------+ 70 | Old-RTT | Estimated | L:TCP_METRIC_RTT | Cached in both | 71 | | Round-Trip | F:rmx_rtt | FreeBSD and Linux, | 72 | | Time | | however it is being | 73 | | | | used by a new | 74 | | | | connection in FreeBSD | 75 | | | | only. | 76 +----------+-------------+------------------+-----------------------+ 77 | Old-RTT | Estimated | L:TCP_METRIC_ | Cached in both | 78 | var | Round-Trip | RTTVAR | FreeBSD and Linux, | 79 | | Time | F:rmx_rttvar | however it is being | 80 | | | | used by a new | 81 | | | | connection in FreeBSD | 82 | | | | only. | 83 +----------+-------------+------------------+-----------------------+ 84 | Old-snd_ | Congestion | L:TCP_METRIC_ | Cached in both | 85 | cwnd | Window | CWND | FreeBSD and Linux, | 86 | | | F:rmx_cwnd | however it is not | 87 | | | | being used by a new | 88 | | | | connection. | 89 +----------+-------------+------------------+-----------------------+ 90 | - | Slow Start | L:TCP_METRIC_ | This is being cached | 91 | | Thresold | SSTHRESH | and shared in both | 92 | | | F:rmx_ssthresh | FreeBSD and Linux. In | 93 | | | | Linux, it is set to | 94 | | | | max(cwnd/2, ssthresh) | 95 | | | | in most cases. In | 96 | | | | FreeBSD, however, it | 97 | | | | is set to either the | 98 | | | | current ssthresh if | 99 | | | | not set previously, | 100 | | | | or to the arithmetic | 101 | | | | ssthresh and | 102 | | | | previously cached | 103 | | | | metric. | 104 +----------+-------------+------------------+-----------------------+ 105 | - | Metric | L:TCP_METRIC_ | This is being cached | 106 | | related to | REORDERING | and shared in Linux. | 107 | | the extent | | | 108 | | of | | | 109 | | reordering. | | | 110 +----------+-------------+------------------+-----------------------+ 111 | - | Estimated | F:rmx_bandwidth | Not in the | 112 | | Bandwidth | | specification. It is | 113 | | | | not set before | 114 | | | | caching when a | 115 | | | | connection is closed. | 116 +----------+-------------+------------------+-----------------------+ 117 | - | Outbound | F:rmx_sendpipe | Not in the | 118 | | Delay - | | specification. This | 119 | | Bandwidth | | is used for socket | 120 | | Product | | buffer in FreeBSD. | 121 | | | | The value is set to 0 | 122 | | | | before caching when a | 123 | | | | connection is closed. | 124 +----------+-------------+------------------+-----------------------+ 125 | - | Inbound | F:rmx_recvpipe | Not in the | 126 | | Delay- | | specification. This | 127 | | Bandwidth | | is used for socket | 128 | | Product | | buffer in FreeBSD. | 129 | | | | The value is set to 0 | 130 | | | | before caching when a | 131 | | | | connection is closed. | 132 +----------+-------------+------------------+-----------------------+ 134 2. IANA Considerations 136 This memo includes no request to IANA. 138 3. Security Considerations 140 To be added 142 Authors' Addresses 144 Michael Welzl 145 University of Oslo 146 PO Box 1080 Blindern 147 Oslo N-0316 148 Norway 150 Phone: +47 22 85 24 20 151 Email: michawe@ifi.uio.no 153 Safiqul Islam 154 University of Oslo 155 PO Box 1080 Blindern 156 Oslo N-0316 157 Norway 159 Phone: +47 22 84 08 37 160 Email: safiquli@ifi.uio.no 162 Joe Touch 163 USC/ISI 164 4676 Admiralty Way, Marina del Rey 165 CA 90292-6695 166 USA 168 Phone: +1 (310) 448-9151 169 Email: touch@isi.edu 171 Jianjie You 172 Huawei 173 101 Software Avenue, Yuhua District 174 Nanjing 210012 175 China 177 Email: youjianjie@huawei.com