From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io1-xd30.google.com (mail-io1-xd30.google.com [IPv6:2607:f8b0:4864:20::d30]) (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 14E583B2A4; Thu, 7 Jan 2021 13:35:13 -0500 (EST) Received: by mail-io1-xd30.google.com with SMTP id o6so7082313iob.10; Thu, 07 Jan 2021 10:35:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to:cc :content-transfer-encoding; bh=v3QcxFoQpnbRlw4WCiEeBG8mtWzLM9OkqgMSpdeg7PI=; b=gGAvcj7ZgFfKeVa11BMB4A1/gShuWW8qglyDvG3CBscsl1rfTPmgKxZ5WXT4iaIdYb 1SEUKQKAkprh8c/FD95jGHP60pSkBctGeG/H7GgPEM4K3e6YNygiCbnjbOA6KIJSF4QG 3KGWSKnvCdroGlhdZAytPpqYOpmnaLXafRvDJskJSfyeDTAUMv9AM+LdNiEkOIHg+61W D3XyyqlTNa6rUkiQ/02EbH4nMIOMcqI05rVN1XTL6N8iAWrvJBrzsk4sV5mBnjYnrGZF YnV4Yb60Jbhjzk2jHNTY+WeDIrAMaDi6gYruUX8foLVmojXco1/myHX7mEi9aymzy3+G kNrA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to:cc :content-transfer-encoding; bh=v3QcxFoQpnbRlw4WCiEeBG8mtWzLM9OkqgMSpdeg7PI=; b=ZbHlbfLz0qAxm9HxgB+c7/6aPJO3OaC+VkNXp7MEgWzawdGGzC7YTgVy29ZvwoSTDU nU7I6X9wYJWE4Dr0Uf1Du3NFAMlxhGDuvJefa4iUlJhyUWjiPwiOkQUj2B1kNiyFGYBQ sDlwo1AJ4yLzYuDkWeTwjMUnngVH9nZIK2NYBTUvo3ZiCZoe5ziVkUf8w8WsFvf9fBup sbx7gGwDrX/5kn/lXRD+Ht082xxZLAfI72rx3HE4eW6l+R3bN/BpsfljlEV40rufJsnw ZM6+GW+SEo1lDpMMqLeL8oK9J7+i8h9hTYZ0wobYqvrgrArFPLFxaFexQ8diB42TrzKG KuNg== X-Gm-Message-State: AOAM53196nTi1HLliSkqzLBbeu+UXbBIqol4zM6fx0B+DA5Ltpyyz9g6 FQVEEn3/I3hMGDbRCiG8EphIe0nGq1ewNvpIn0719RKO/DaXZg== X-Google-Smtp-Source: ABdhPJxTZV/dWYJs9yLM4yWgqAdnnnog65sKnhmj28RvIKJUXsRLjcJ4msCHmZCOpXJDTI2Ji2l4JU0R1zRt1eMmk8o= X-Received: by 2002:a02:a304:: with SMTP id q4mr9010729jai.97.1610044512287; Thu, 07 Jan 2021 10:35:12 -0800 (PST) MIME-Version: 1.0 From: Dave Taht Date: Thu, 7 Jan 2021 10:35:00 -0800 Message-ID: To: bloat , codel@lists.bufferbloat.net, ECN-Sane , Make-Wifi-fast , flent-users , BBR Development Cc: ghosal@cs.ucdavis.edu, tflynn@ucdavis.edu Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Subject: [Ecn-sane] D* tcp looks pretty good, on paper X-BeenThere: ecn-sane@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: Discussion of explicit congestion notification's impact on the Internet List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Jan 2021 18:35:13 -0000 See: https://arxiv.org/pdf/2012.14996.pdf Things I really like: * they used flent * Using "variance" as the principal signal. This is essentially one of the great unpublished and unanalyzed improvements on the minstrel algorithm as well * Conventional ecn response * outperforms bbr on variable links Only negative so far is I haven't found any published source to it. :( Otherwise a very promising start to a year. "The choice of feedback mechanism between delay and packet loss has long been a point of contention in TCP congestion control. This has partly been resolved, as it has become increasingly evident that delay based methods are needed to facilitate modern interactive web applications. However, what has not been resolved is what control should be used, with the two candidates being the congestion window and the pacing rate. BBR is a new delay based congestion control algorithm that uses a pacing rate as its primary control and the congestion window as a secondary control. We propose that a congestion window first algorithm might give more desirable performance characteristics in situations where latency must be minimized even at the expense of some loss in throughput. To evaluate this hypothesis we introduce a new congestion control algorithm called TCP D*, which is a congestion window first algorithm that adopts BBR's approach of maximizing delivery rate while minimizing latency. In this paper, we discuss the key features of this algorithm, discuss the differences and similarity to BBR, and present some preliminary results based on a real implementation." --=20 "For a successful technology, reality must take precedence over public relations, for Mother Nature cannot be fooled" - Richard Feynman dave@taht.net CTO, TekLibre, LLC Tel: 1-831-435-0729