From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf0-x244.google.com (mail-lf0-x244.google.com [IPv6:2a00:1450:4010:c07::244]) (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 636983B2A4 for ; Wed, 18 Jan 2017 00:51:50 -0500 (EST) Received: by mail-lf0-x244.google.com with SMTP id h65so285160lfi.3 for ; Tue, 17 Jan 2017 21:51:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=KfVaShTrECMk1Yg6Zgb3toReB/vW4hLrgIE6HWLQU84=; b=qEPyE58jEUsLhyifOf4nZU/BMG8N7h/7u9jHWu79NR5ukIqJPt6V0T1CzKIQp/1MKT v3VxOMNyTOL/vnYbLXgVaDcB81ltfxzZirV9MRyFyo02elRW4WpWnhhZk+Y9oUk3IX5n deTr+X1HuZi5hrumJhcWj9rpSEiCpYuvlv+CurTj1IBO57uO9tzR+O9bSqgB4Z1HmGFI LUwnJSUPnjc8eG9vjM8BddEnq4fuqfElN/ZSYg0/t5bhN6OWfVJJ91m6kvATY4v7IOKJ 33LMxUsHoz0hYhcKHJOhxhHzXWXOhY+u++Glh6APbX61GS6JJr9FAlhjVwarG0tBnFRH Z99g== 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=KfVaShTrECMk1Yg6Zgb3toReB/vW4hLrgIE6HWLQU84=; b=YZGdSWAjC0KyMczS3GbnYr5L5YJay8Lmd645mWwDu/1YG9YZknG4uPpSCZrGGeUTQA A/FWUVCuDViGV3VUblqevfAEkChifI6hT6UNWXsIBjMVLxUkAMjKcbxPO5BCRsay6yjR 8rX/9srFFVuAUVGVzBxzsdQlwsAdLmblEQF3BfKVm1yqQrcMfxwsbmm+7fhOxf9RlJC0 cLfzknyXXwgGBwfGLKB88mKERLlhid0ebgnlx9cL9qSGrZAX2t1ULbPmscYmuvyrgqnR 7ssY5Xjx38cCaJ/H45uT6iF9x8klNCO8TzFAxO7DJrfHKemzSLx4DU8SrO1+4IDRC81K lGHQ== X-Gm-Message-State: AIkVDXIybfcvZCQixYQcB6tY6mBlqafOY9sxfdpIrkUNoCPwjzqW04OG4jhF+zz8wanWVw== X-Received: by 10.25.29.195 with SMTP id d186mr456099lfd.72.1484718708972; Tue, 17 Jan 2017 21:51:48 -0800 (PST) Received: from [192.168.100.13] (37-136-37-228.rev.dnainternet.fi. [37.136.37.228]) by smtp.gmail.com with ESMTPSA id e86sm9508005lji.32.2017.01.17.21.51.47 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 17 Jan 2017 21:51:48 -0800 (PST) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) From: Jonathan Morton In-Reply-To: Date: Wed, 18 Jan 2017 07:51:46 +0200 Cc: cake@lists.bufferbloat.net Content-Transfer-Encoding: quoted-printable Message-Id: <1794DF2C-108F-488D-AE25-48B1D87F36E5@gmail.com> References: To: Dave Taht X-Mailer: Apple Mail (2.3124) Subject: Re: [Cake] cake at longer rtts 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: Wed, 18 Jan 2017 05:51:50 -0000 > On 18 Jan, 2017, at 05:35, Dave Taht wrote: >=20 > It has been quite some time since I looked at cake at longer RTTs. >=20 > Here's a single flow test comparing it to sonic fiber default fifo > (50ms delay in the ONT), to fq_codel, to cake at 110mbit. >=20 > http://www.taht.net/~d/sonic_cake_vs_fq_codel_vs_fifo_70ms.png Seems to be more aggressive than fq_codel on the slow-start response, = but very similar thereafter. I think that=E2=80=99s consistent with = what I believe I=E2=80=99ve implemented, and with some tests I=E2=80=99ve = been running over here. In my experience, Westwood+ performs better than CUBIC with Codel, = because it estimates the true BDP better and hops directly to it when = the signal arrives. Probably BBR has similar properties, but with = different semantics. I sometimes use longer assumed-RTTs, ie. =E2=80=9Coceanic=E2=80=9D or = =E2=80=9Csatellite=E2=80=9D, in order to get a little more throughput. = However, this significantly reduces the latency control in ingress mode, = because every slow-start is then uncontrolled for a full second. - Jonathan Morton