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 DFDD23CB37 for ; Sat, 23 Mar 2019 11:19:12 -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 1h7iQO-0006xB-EV; Sat, 23 Mar 2019 16:19:08 +0100 Received: from [IPv6:::1] (localhost [127.0.0.1]) by i72vorta.tm.kit.edu (Postfix) with ESMTPS id 2799342005D; Sat, 23 Mar 2019 16:19:08 +0100 (CET) From: Roland Bless To: Mikael Abrahamsson Cc: Victor Hou , bloat@lists.bufferbloat.net References: <2c8ad5fe4be5c52ad1a3c2bf7f91a09a@mail.gmail.com> <00674bef-877b-3ccc-9c8e-e7e06ee8e1cd@kit.edu> Openpgp: preference=signencrypt Autocrypt: addr=roland.bless@kit.edu; prefer-encrypt=mutual; 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U; Linux i686; en-US; rv:1.8.0.1) Gecko/20060111 Thunderbird/1.5 Mnenhy/0.7.3.0 MIME-Version: 1.0 In-Reply-To: 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 1553354348.536589899 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: Sat, 23 Mar 2019 15:19:13 -0000 Hi Mikael, On 23.03.19 at 11:02 Mikael Abrahamsson wrote: > On Sat, 23 Mar 2019, Roland Bless wrote: > >> I suggest to use an additional DSCP to mark L4S packets. > > DSCP doesn't work end-to-end on the Internet, so what you're suggesting > isn't a workable solution. It's true that DSCPs may be remarked, but RFC 2474 already stated Packets received with an unrecognized codepoint SHOULD be forwarded as if they were marked for the Default behavior (see Sec. 4), and their codepoints should not be changed. The rtcweb WG also counts on e2e DSCPs. After the LE PHB experience I would suggest to probably use DSCP 5 which has got better chances to survive ToS bleaching (maybe around 80%), if I understand https://www.sciencedirect.com/science/article/pii/S0140366417312835 correctly. Diffserv behavior is usually configurable and can be changed without replacing the network gear. Regards Roland