[tcpm] Re: I-D Action: draft-ietf-tcpm-accurate-ecn-30.txt

rs.ietf@gmx.at Sun, 07 July 2024 08:12 UTC

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Subject: [tcpm] Re: I-D Action: draft-ietf-tcpm-accurate-ecn-30.txt
Archived-At: <https://mailarchive.ietf.org/arch/msg/tcpm/fToUHXc1FumraqsAbe5Fdhm1_zA>

This revision updates the text around TCP offloading in section 3.3.4,
with improved wording to differentiate between the transmit (TSO) and
receive (LRO) paths.

Specific implmenentation details are not given, but sufficient hints
what needs to be considered when implementing Accurate ECN on current
offloading hardware.

Best regards,
   Richard Scheffenegger



Am 07.07.2024 um 10:00 schrieb internet-drafts@ietf.org:
> Internet-Draft draft-ietf-tcpm-accurate-ecn-30.txt is now available. It is a
> work item of the TCP Maintenance and Minor Extensions (TCPM) WG of the IETF.
>
>     Title:   More Accurate Explicit Congestion Notification (ECN) Feedback in TCP
>     Authors: Bob Briscoe
>              Mirja Kühlewind
>              Richard Scheffenegger
>     Name:    draft-ietf-tcpm-accurate-ecn-30.txt
>     Pages:   72
>     Dates:   2024-07-07
>
> Abstract:
>
>     Explicit Congestion Notification (ECN) is a mechanism where network
>     nodes can mark IP packets instead of dropping them to indicate
>     incipient congestion to the endpoints.  Receivers with an ECN-capable
>     transport protocol feed back this information to the sender.  ECN was
>     originally specified for TCP in such a way that only one feedback
>     signal can be transmitted per Round-Trip Time (RTT).  Recent new TCP
>     mechanisms like Congestion Exposure (ConEx), Data Center TCP (DCTCP)
>     or Low Latency, Low Loss, and Scalable Throughput (L4S) need more
>     accurate ECN feedback information whenever more than one marking is
>     received in one RTT.  This document updates the original ECN
>     specification in RFC 3168 to specify a scheme that provides more than
>     one feedback signal per RTT in the TCP header.  Given TCP header
>     space is scarce, it allocates a reserved header bit previously
>     assigned to the ECN-Nonce.  It also overloads the two existing ECN
>     flags in the TCP header.  The resulting extra space is exploited to
>     feed back the IP-ECN field received during the 3-way handshake as
>     well.  Supplementary feedback information can optionally be provided
>     in two new TCP option alternatives, which are never used on the TCP
>     SYN.  The document also specifies the treatment of this updated TCP
>     wire protocol by middleboxes.
>
> The IETF datatracker status page for this Internet-Draft is:
> https://datatracker.ietf.org/doc/draft-ietf-tcpm-accurate-ecn/
>
> There is also an HTMLized version available at:
> https://datatracker.ietf.org/doc/html/draft-ietf-tcpm-accurate-ecn-30
>
> A diff from the previous version is available at:
> https://author-tools.ietf.org/iddiff?url2=draft-ietf-tcpm-accurate-ecn-30
>
> Internet-Drafts are also available by rsync at:
> rsync.ietf.org::internet-drafts
>
>
> _______________________________________________
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[tcpm] I-D Action: draft-ietf-tcpm-accurate-ecn-3… internet-drafts
[tcpm] Re: I-D Action: draft-ietf-tcpm-accurate-e… rs.ietf