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Re: [tsvwg] [Bloat] [Ecn-sane] [iccrg] Fwd: [tcpPrague] Implementation and experimentation of TCP Prague/L4S hackaton at IETF104

"Bless, Roland (TM)" <roland.bless@kit.edu> Thu, 21 March 2019 08:49 UTC

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To: Bob Briscoe <ietf@bobbriscoe.net>, Jonathan Morton <chromatix99@gmail.com>
Cc: tsvwg IETF list <tsvwg@ietf.org>, bloat <bloat@lists.bufferbloat.net>
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From: "Bless, Roland (TM)" <roland.bless@kit.edu>
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Organization: Institute of Telematics, Karlsruhe Institute of Technology
Message-ID: <3d6b1619-ce5d-5649-0436-72bb10115e45@kit.edu>
Date: Thu, 21 Mar 2019 09:49:02 +0100
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Subject: Re: [tsvwg] [Bloat] [Ecn-sane] [iccrg] Fwd: [tcpPrague] Implementation and experimentation of TCP Prague/L4S hackaton at IETF104
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Hi,

Am 21.03.19 um 09:02 schrieb Bob Briscoe:
> Just to rapidly reply,
> 
> 
> On 21/03/2019 07:46, Jonathan Morton wrote:
>> The ECN field was never intended to be used as a classifier, except to
>> distinguish Not-ECT flows from ECT flows (which a middlebox does need
>> to know, to choose between mark and drop behaviours).  It was intended
>> to be used to convey congestion information from the network to the
>> receiver.  SCE adheres to that ideal.
> 
> Each PHB has a forwarding behaviour a DSCP re-marking behaviour and an
> ECN marking behaviour. The ECN field is the claissifer for the ECN
> marking behaviour.

That's exactly the reason, why using ECT(1) as classifier for L4S
behavior is not the right choice. L4S should use a DSCP for
classification, because it is actually defining a PHB.

Regards
 Roland

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