From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf0-x241.google.com (mail-lf0-x241.google.com [IPv6:2a00:1450:4010:c07::241]) (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 6734D3B260; Thu, 26 May 2016 08:34:02 -0400 (EDT) Received: by mail-lf0-x241.google.com with SMTP id w16so3788736lfd.0; Thu, 26 May 2016 05:34:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=V1R/jWGyaOW+JbIM52zCJKvZqAiL8nYoq7jzA+EvtPU=; b=v+d3ub56QlarV8A5IOMDnZzRBibPSfsZlDvsQtOqRoh75ZAgFzF1CD+5B8YriSNJS/ tMVOqUQ4jAZTZNJmtfibpb5Ki1OVvPGEMk7FwSNNZIMR0104qiP+o3nNcppW+dvpI3XJ 6ul/kgjkvblh8z+jiSlKr3MU2eIUtgGB6NZLRUDUwrFNSPnWcPeuG1bCA2FnIQHq/87W A0lBl1OAWVnm/g/2Vm242m8P4knMyL/vSatZLqN2s2TCOG/b428UBihS7XLn+fhlfxWs on5sFAYFhjLlw8Dz49JE5YgiflR10Ic7ut3RQwF93/xsDG7VniTgT16CB49or5lcahQs l7gw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=V1R/jWGyaOW+JbIM52zCJKvZqAiL8nYoq7jzA+EvtPU=; b=MAIjDOVPhoq5NB1dn6mnZ7C+dUOcsuyjZuS/nO1sVt1Vzgi2G9/k634msjl098QAXO iNvBJhRMJxvhQeRqibpvrnVZlZON6vAO8TFpjKLi8VHtAgToKkVCgCWGDhapKkvCNMUM 6sQuiyJJcHlwzWg6yRWXgZsXoLoRXvmiTW7zatyOZSb1cuYYdktBvy4Abw+C34fC3+EX aieUZeDF3EHZh3pbq+YAf3epFQwWkE1pCnIUFRoQWrOcSdDQj5R4OXWQJN3ABUiWX7dW 5KgDb9Bz2mOC0GeLyCxn0XTDjal3LvEw/TcAHe0Pppd9/D5ap95DqRMeZVrcHsGX6VbY cLwQ== X-Gm-Message-State: ALyK8tIwZYtNicKdnQc5eywvYFT6kEj3qGm32QFYQF1vsDcG5ErjuCHXORjeOZbAazbkmQ== X-Received: by 10.25.158.131 with SMTP id h125mr2701370lfe.165.1464266041138; Thu, 26 May 2016 05:34:01 -0700 (PDT) Received: from bass.home.chromatix.fi (188-67-138-144.bb.dnainternet.fi. [188.67.138.144]) by smtp.gmail.com with ESMTPSA id zo8sm2357042lbb.15.2016.05.26.05.33.59 (version=TLSv1/SSLv3 cipher=OTHER); Thu, 26 May 2016 05:34:00 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) From: Jonathan Morton In-Reply-To: <574478B4.7080103@taht.net> Date: Thu, 26 May 2016 15:33:54 +0300 Cc: codel@lists.bufferbloat.net, cake@lists.bufferbloat.net Content-Transfer-Encoding: quoted-printable Message-Id: <39F38477-A877-4C1B-9B7F-BB3358425F17@gmail.com> References: <22371476-B45C-4E81-93C0-D39A67639EA0@gmx.de> <857AEE56-E7DB-4981-B32E-82473F877139@gmail.com> <8AB0D25D-C1CA-45F1-889E-2F73CF8C44F7@gmail.com> <323AFC22-A092-4F59-8197-AF21EF73FD58@gmail.com> <274D3A0FA900FD47AA6B56991AAA32FDC5529FC8@wtl-exchp-1.sandvine.com> <574478B4.7080103@taht.net> To: =?utf-8?Q?Dave_T=C3=A4ht?= X-Mailer: Apple Mail (2.3124) Subject: Re: [Cake] [Codel] Proposing COBALT 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: Thu, 26 May 2016 12:34:02 -0000 > On 24 May, 2016, at 18:52, Dave T=C3=A4ht wrote: >=20 > My last attempts with cake the way it was had it performing miserably = at > longer RTTs (try 50ms) vs codel or fq-codel - as in half the = throughput > achieved by codel, at that RTT. There=E2=80=99s definitely something weird going on - as if the marks = and drops reported by the stats are not actually occurring, except for = the drops on queue overflow. Testing 50:1 flows on 1:10 bandwidth, for example, the single flow is = stuck below the aggregate throughput of the 50, suggesting strongly that = its acks are not being thinned. Cake used to be best-in-class on that = very test. I will investigate further. But the solution may be to just perform the = refactoring necessary to cleanly integrate COBALT, and eliminate subtle = bugs by dint of simply sweeping away some unnecessarily gnarly code. I = think COBALT=E2=80=99s API is probably a lot easier to integrate into a = complex qdisc than Codel=E2=80=99s. - Jonathan Morton