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Re: [tcpm] ECN++

Bob Briscoe <in@bobbriscoe.net> Thu, 13 February 2020 18:54 UTC

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To: "Scheffenegger, Richard" <rs.ietf@gmx.at>, "tcpm@ietf.org" <tcpm@ietf.org>, draft-ietf-tcpm-generalized-ecn@ietf.org
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From: Bob Briscoe <in@bobbriscoe.net>
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Date: Thu, 13 Feb 2020 18:54:12 +0000
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Subject: Re: [tcpm] ECN++
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Richard,

On 10/01/2020 00:08, Scheffenegger, Richard wrote:
> Marcelo, Bob,
>
> I just noted that there is a slight oversight in FreeBSD currently,
> which results in all session that are simultaneously ECN-enabled and
> SACK-permitted to effectively send out retransmissions with the ECT0
> codepoint.
>
> Strictly speaking, this is in violation of RFC3168, but might also be a
> good (nearly a decade long) validation of the performance of ECN++ for
> all types of data segments (new and retransmitted ones), although at a
> low and implicit exposure...
[BB] Let's hope someone has captured some relevant data.

>
>
> On that note, since I think ECN++ is quite valuable (with a number of
> published research finding this change to be crucial), perhaps you can
> summarize the outstanding issues (other than more reviewers required; I
> admit I still haven't gone through all the delta between -04 and -05).
[BB] I don't think there are any outstanding issues.

I have some word-smithing in my ToDo list, in the light of the most 
recently agreed change regarding ECT on SYN.
But no new technical controversy, AFAICT.



Bob
>
> Best regards,
>   Richard
>
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-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/

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