Re: [tcpm] Possible error in accurate-ecn

"Scheffenegger, Richard" <rs.ietf@gmx.at> Tue, 17 November 2020 08:54 UTC

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To: Yoshifumi Nishida <nsd.ietf@gmail.com>, Mirja Kuehlewind <ietf@kuehlewind.net>
Cc: tcpm IETF list <tcpm@ietf.org>, Richard Scheffenegger <rscheff@gmx.at>, Bob Briscoe <research@bobbriscoe.net>
References: <47df9b8b-515e-d40d-3473-599b0a3e3876@bobbriscoe.net> <6031BE2B-4D33-426F-BA17-DDF15CF821DE@kuehlewind.net> <CAAK044SDbJHGYrzyv4ipMojEdxPEH4Rnr0AKpGC-n141SuRBYg@mail.gmail.com>
From: "Scheffenegger, Richard" <rs.ietf@gmx.at>
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Date: Tue, 17 Nov 2020 09:53:38 +0100
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Subject: Re: [tcpm] Possible error in accurate-ecn
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This would preclude the use of AccECN for AckCC purposes; effectively
allowing ACKs only to be sent for data packets.. (or a stream of
CE-marked ACKs after an unacked "uneven" data packet was received before).

If the last prior data packet was already ACKs, and then a stream of
CE-marked pure ACKs is observed, we loose synchronizity of the AccECN
counters...

Am 11.11.2020 um 10:37 schrieb Yoshifumi Nishida:
>
> "can send a pure ack on a pure ack when the ack value advances"?
> --
> Yoshi