From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from iramx2.ira.uni-karlsruhe.de (iramx2.ira.uni-karlsruhe.de [IPv6:2a00:1398:2::10:81]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 7EC903CB36 for ; Thu, 21 Mar 2019 04:49:08 -0400 (EDT) Received: from i72vorta.tm.uni-karlsruhe.de ([141.3.71.26] helo=i72vorta.tm.kit.edu) by iramx2.ira.uni-karlsruhe.de with esmtpsa port 25 iface 141.3.10.8 id 1h6tNn-0004oK-1u; Thu, 21 Mar 2019 09:49:03 +0100 Received: from [IPv6:::1] (ip6-localhost [IPv6:::1]) by i72vorta.tm.kit.edu (Postfix) with ESMTPS id EDA00420077; Thu, 21 Mar 2019 09:49:02 +0100 (CET) To: Bob Briscoe , Jonathan Morton Cc: tsvwg IETF list , bloat References: <1E80578D-A589-4CA0-9015-B03B63042355@gmx.de> <27FA673A-2C4C-4652-943F-33FAA1CF1E83@gmx.de> <1552669283.555112988@apps.rackspace.com> <7029DA80-8B83-4775-8261-A4ADD2CF34C7@akamai.com> <1552846034.909628287@apps.rackspace.com> <5458c216-07b9-5b06-a381-326de49b53e0@bobbriscoe.net> <7e49b551-22e5-5d54-2a1c-69f53983d7e5@bobbriscoe.net> <04E62EA7-82EF-4F1B-A86D-5A23CA3B190A@gmail.com> <10ac0f0f-1635-a0b3-6150-2ff3d63be788@bobbriscoe.net> From: "Bless, Roland (TM)" Openpgp: preference=signencrypt Autocrypt: addr=roland.bless@kit.edu; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.1 MIME-Version: 1.0 In-Reply-To: <10ac0f0f-1635-a0b3-6150-2ff3d63be788@bobbriscoe.net> Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: 8bit X-ATIS-AV: ClamAV (iramx2.ira.uni-karlsruhe.de) X-ATIS-Timestamp: iramx2.ira.uni-karlsruhe.de esmtpsa 1553158143.192252431 Subject: Re: [Bloat] [Ecn-sane] [iccrg] Fwd: [tcpPrague] Implementation and experimentation of TCP Prague/L4S hackaton at IETF104 X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 Mar 2019 08:49:08 -0000 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