From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr1-x443.google.com (mail-wr1-x443.google.com [IPv6:2a00:1450:4864:20::443]) (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 AE2A83CB35 for ; Sun, 3 Mar 2019 11:35:18 -0500 (EST) Received: by mail-wr1-x443.google.com with SMTP id n2so2896065wrw.8 for ; Sun, 03 Mar 2019 08:35:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=heistp.net; s=google; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=UMIQ3Aa5HlIn5S4W0cp5MKZOzufEzaGYzlvHP2+uGDM=; b=GA6lF6tCyIJYgrYqMGmlmnWm+BMia8F93lUYrsRntz7IcVnxkDmiaHLOesTLejH1Ju 79S/uVhw3DQcxmaUnJBShuQ1DiJARu2tAGe1kVTf5GXBwGM+1djjkI94NkEbCp5wjND6 kV73YG8XTgWYfmV5+ahKpzeBK8gZHjKlY6H70QNKuR4RofyarZvKGQpowiAGREwpUrEw 5rQ3xBWzotAsFTgQairSJV9XW0gfvtYPwbPLQ8ROvIilWuJSxCBIc+S/XuywaihNKzfM CTaAasc6jR8BBVIJx2nYHU9VWzDQpsdCikqbqwmy3Nn6/ci/VSr4XgsTUzLgCfbj0oNN NCig== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=UMIQ3Aa5HlIn5S4W0cp5MKZOzufEzaGYzlvHP2+uGDM=; b=oLEnCCNqygsZSjPzpd4R6cSXSMW9RNLcEu1Fv3RiAkcbPAEhiBR9CLRcWb/Q71nmRX jbiO4VEOyjUI5wCGR6Hftt7/59mESWi90bywa9Lg+ucQtwG7YhmoJvVujhf+UsR4VvSO ijXVA2575kl0Ei9YWX/z3j3Zdg2Pegiw8y95afgcNUj7Ow3tZFCm4LuAEDHLyGwBve9y L6eRkscWTtW5G5CxtnebZl5wAc8IzJ3Ck0F4mxgT0XwK09n2ovE1yQq+/KW9XPD2oFU4 ceLesAg/VjHmYQ+ognlqWWbmLq7wj9Hkyb+700JQJLQVYsUIY5kRo5Ngupsg2x9XadGY QqPg== X-Gm-Message-State: APjAAAUwsHw+MoXGD8sJxuZSAodrIzNXlKJB/xEfbNIA6VF8JGsBsnId XmujO0RGO9/1O4jcX3eOm75pQw== X-Google-Smtp-Source: APXvYqxg/AJlT7Bl4K2j8gL72OwDEY04uV0CC+NcOY3xpgyJ+1cDF1N3pKEjK1H7K5tRQWZct/Unsw== X-Received: by 2002:adf:eb85:: with SMTP id t5mr10109834wrn.168.1551630917835; Sun, 03 Mar 2019 08:35:17 -0800 (PST) Received: from [10.72.0.64] (h-1169.lbcfree.net. [185.193.85.130]) by smtp.gmail.com with ESMTPSA id a8sm2907980wrt.79.2019.03.03.08.35.16 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 03 Mar 2019 08:35:17 -0800 (PST) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.1\)) From: Pete Heist In-Reply-To: <1C81557C-2FD5-4C48-BC17-F9E841D08097@gmail.com> Date: Sun, 3 Mar 2019 17:35:15 +0100 Cc: Sebastian Moeller , =?utf-8?Q?Toke_H=C3=B8iland-J=C3=B8rgensen_via_Cake?= , George Amanakis Content-Transfer-Encoding: quoted-printable Message-Id: References: <72193310-7502-47B8-9554-7F8F9FA23204@heistp.net> <874l8mn9iy.fsf@toke.dk> <417E17B2-17F7-4106-A92D-C5B5AC41D808@gmx.de> <5CC769AC-AD0C-40E8-BFCA-6AD2A8162FFC@gmail.com> <49A8FB42-EC0B-41B7-8CE4-888DF3C2A88D@gmx.de> <542D3BC3-317A-4F3E-A5B6-16FF678DDFAC@gmail.com> <5C8177FD-2605-4CDD-9AA2-F0E5AF9C779B@heistp.net> <1C81557C-2FD5-4C48-BC17-F9E841D08097@gmail.com> To: Jonathan Morton X-Mailer: Apple Mail (2.3445.9.1) Subject: Re: [Cake] Upstream submission of dual-mode fairness patch X-BeenThere: cake@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: Cake - FQ_codel the next generation List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 03 Mar 2019 16:35:18 -0000 > On Mar 3, 2019, at 5:10 PM, Jonathan Morton = wrote: >=20 >> On 3 Mar, 2019, at 6:07 pm, Pete Heist wrote: >>=20 >> Does it say anything to you that enabling ECN makes the asymmetry go = away? >=20 > Yes - it tells me that it has something directly to do with how = dropped packets are accounted for, not with the congestion response by = TCP. ECN changes the number of dropped packets, and shouldn't change = the congestion response. That suggests it=E2=80=99s possible to fix. It almost seems like in = ingress mode, dropped packets are being counted as bytes transferred, = when they weren=E2=80=99t. In the four pcaps I sent, enabling ECN resulted in 0 dropped packets for = the N flows down, so it didn=E2=80=99t get to the point where a drop was = necessary. Also, the rate of CWR bits set was a bit lower than the rate = of drops, and total aggregate throughput was a bit higher. so enabling = ECN is a win in this test.=