| 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
This document provides an overview of the state of implementation of RFC 2140, in preparation for a possible future RFC2140bis document.
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* 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 | | | | | 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. | +----------+-------------+------------------+-----------------------+
This memo includes no request to IANA.
To be added