From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ed1-x531.google.com (mail-ed1-x531.google.com [IPv6:2a00:1450:4864:20::531]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 67DEE3B29D for ; Sat, 2 Apr 2022 18:38:12 -0400 (EDT) Received: by mail-ed1-x531.google.com with SMTP id a17so6885434edm.9 for ; Sat, 02 Apr 2022 15:38:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:from:date:message-id:subject:to :content-transfer-encoding; bh=HaMnY6m8XjZ/ridxSHAadDDeoGHvMUUGKa+Pj0S68RU=; b=J5RXsZLTFWgr0WFjVDFtBOB8hIjQFrqMKK4SSsZDkaYM97Z9WCZ+UigK01xZKAR7Iz sYoH3FaDHnUd//5qWKCjoi1nlFmwheEiqso0itDWhqiUQ7d8MCJFiJz7GcY61IqkWhPN /qtYvR0DLu9dYT0aaIp8f2pFxPGf/exAJSCVO8ACevyfKEaUJXVots9r5dEE3UmqkWhg cNtLitw8vUhkiQW4pBTP4YZLelf+P8RkBrXp76fbI84aOPPOvW5xLSYqsbAqQ8E3l9P0 K/kWJPgu3kvd5Xc51DZtPR8G5knbnGubw0YgxcF2Z5eFOQHDgoirK+YN3kfZbyuR9GCk CGDA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:from:date:message-id:subject:to :content-transfer-encoding; bh=HaMnY6m8XjZ/ridxSHAadDDeoGHvMUUGKa+Pj0S68RU=; b=MeemOoE0ZFGLusWrKWKx6DADnuKP5/DLA6ao6bUejKF5No+XJV6cqPkABFCdEm96Uy Ware4w4IKRIlhFOwLeYTNNZgtM4fJw71sc1cVZuYIVmgNJdi6jZRg4cVQTk8M5bnDtje 3U0TXuMX6IfQrItJu3aOXKRTwqyoGOjVyujVJSW5anAtccSOeYBLTWMGuHtDy4PoErjn Z5za9z/ty2WLVx2pFucav8dr/NtdZ8B1Vy7lGeKJnGtYXo2ypLbM3mEDV/9LLr+s2FLa 4oc9gNMr8YsaWGXB0B5m71RID59ZdRUtLhFdDg+jshCJaslQj3DhYl+xPz2slrtqL1zQ AdMA== X-Gm-Message-State: AOAM530+4U7G/7mL5/D+T4X9DojawovwXlG7c9qvlQVYWb3n5IBm12cF iiUas+RsoUSjNJ0tqIRIRUC4z2+M4cpHhLozHqU= X-Google-Smtp-Source: ABdhPJzAa0b9M2gm4twdFYX2O77M2LQmdW8FtucUpMoilVfjW8mIn2J+gZ0CJBVa7hgCLl9TN1VuU4Or5hywycnZAnE= X-Received: by 2002:a05:6402:5111:b0:419:74a6:6dc0 with SMTP id m17-20020a056402511100b0041974a66dc0mr26832480edd.293.1648939090905; Sat, 02 Apr 2022 15:38:10 -0700 (PDT) MIME-Version: 1.0 From: Dave Taht Date: Sat, 2 Apr 2022 15:37:59 -0700 Message-ID: To: biz.tinalee@gmail.com, bloat Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Subject: [Bloat] less than best effort: TCP - flexis - A New Approach To Incipient Congestion Detection and Control 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, 02 Apr 2022 22:38:12 -0000 Dear Qian: Pretty promising paper. I liked that it tackled congestion on the ack path, among other things. https://www.techrxiv.org/articles/preprint/TCP_FlexiS_A_New_Approach_To_Inc= ipient_Congestion_Detection_and_Control/19077161/1/files/33905018.pdf I like also that you tackled, inter-rtt fairness, and, ledbat's latecomer advantage problem, and in fig 9, the basic problem with delay based LBE vs AQMs (in that ledbat degrades to reno)... [1] Towards your conclusion... I have always disagreed with the "don't reduce segment size" crowd, btw. If you have a rate where you need to go below 2mss, it doesn't hurt the network to reduce the size of the packet, and you can keep the signal strength up by reducing that size and continuing to sample rtt, to respond quickly. Even if you are only passing a single byte of data, by lowering this below everyone else's 2mss noise floor, you still eventually win, and also you occupy space in packet fifos, reducing overall latency, as bytes=3Dtime. IMHO. elsewhere, sub-packet windows are being experimented in bbrv2, I'm told, but not in LBE. I'm also a big believer in packet pacing, and I think this is the first paper I've seen that attempted LBE with it. Thx! Got a git tree? [1] do wish you'd had cited https://perso.telecom-paristech.fr/drossi/paper/rossi14comnet-b.pdf --=20 I tried to build a better future, a few times: https://wayforward.archive.org/?site=3Dhttps%3A%2F%2Fwww.icei.org Dave T=C3=A4ht CEO, TekLibre, LLC