From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from iramx2.ira.uni-karlsruhe.de (iramx2.ira.uni-karlsruhe.de [141.3.10.81]) (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 D6CA43BA8E for ; Wed, 6 Jun 2018 03:44:37 -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 esmtp port 25 iface 141.3.10.81 id 1fQT7T-0002e7-Pn; Wed, 06 Jun 2018 09:44:35 +0200 Received: from [IPv6:::1] (ip6-localhost [IPv6:::1]) by i72vorta.tm.kit.edu (Postfix) with ESMTPS id BA32D420467; Wed, 6 Jun 2018 09:44:35 +0200 (CEST) To: Sebastian Moeller , Jonathan Foulkes Cc: Jonathan Morton , bloat References: <152717340941.28154.812883711295847116.malone@soybean.canonical.com> <4f67f9b3-05a1-8d15-0aee-dfe8ea730d7c@gmail.com> <73c25a21-0ace-b5ee-090e-d06fb3b8dc60@kit.edu> <3F65061F-4F05-4F3F-8A43-FFCC1D27F585@gmail.com> <61E48C91-AEF9-4FF4-9F83-45EC7148EC54@jonathanfoulkes.com> <9675C88A-FCC0-43EB-9C71-CBEFD67408CB@gmx.de> From: "Bless, Roland (TM)" Openpgp: preference=signencrypt Autocrypt: addr=roland.bless@kit.edu; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 MIME-Version: 1.0 In-Reply-To: <9675C88A-FCC0-43EB-9C71-CBEFD67408CB@gmx.de> 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 1528271075.913586459 Subject: Re: [Bloat] [Bug 1436945] Re: devel: consider fq_codel as the default qdisc for networking 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: Wed, 06 Jun 2018 07:44:38 -0000 Hi, Am 05.06.2018 um 20:34 schrieb Sebastian Moeller: > The rationale for that decision still is valid, at low bandwidth every opportunity to send a packet matters and every packet being transferred will increase the queued packets delay by its serialization delay. The question IMHO is more is 4 Mbps a reasonable threshold to disable ECN or not. ECN should be enabled irrespective of the current bottleneck bandwidth. I don't see any relationship between serialization delay with ECN. Congestion control is about determining the right amount of inflight data. ECN just provides an explicit congestion signal as feedback and helps anyway. The main problem is IMHO that most routers have no AQM in place in order to set the CE codepoint appropriately... Regards, Roland