From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf1-x142.google.com (mail-lf1-x142.google.com [IPv6:2a00:1450:4864:20::142]) (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 18E903CB47 for ; Fri, 13 Dec 2019 09:02:23 -0500 (EST) Received: by mail-lf1-x142.google.com with SMTP id f15so2017414lfl.13 for ; Fri, 13 Dec 2019 06:02:22 -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=pLc1jQlEKheICgeOSU9VB7wm/Oqb5tm2L+1FZGaf4ts=; b=HszVTQ2pG44bN0JLbd0qM8xn0j0dSwFivX/xjy/Ckb7DEmFCEkhpUTBlrE6XKCWwqU y+amrawfbNtTgF/gkvPLC/XYFAn3yU4rkjYqZSgdt0yvuvUhJygOulTq6eLOgeTxNntg LlKNYlGtt0WArl6UGJuoCOpB2YmsOsMaG4mP5yqB9wFEnKQMQtVen2zNKkyhnxBtem3s FGXW7R/VzVKC37XUWN+Kwod2aaAKRjnDiUauYoBKaif+0tvrIU6QiqnJNV6x5Wf3GAu9 StW0pAU03DKKR644+4IwlmH3ZBZ0cQWNSfFqPgkBAKBiIHAHMwbX/BfrEony+DbqLt38 8ghg== 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=pLc1jQlEKheICgeOSU9VB7wm/Oqb5tm2L+1FZGaf4ts=; b=gsdwA2wwskzmmaA3YmpKo6tqtqilS+zEEo42fDUpXmoybvcCB1YMqhaHerSLeSz66B DAlBrVeUhiPhJ+l5eG0NwvkbJn6AfFUFtkoXcBl9QVNFUNzf735M22+hz4nKXtHTSxbG FLTymmdmF7RmRvR4vP6YZ6AcFuRlU9IuVVMWsiqz0q9TAT4u2rXWkHrdKfEmsECcQcov nFInpAdSWOS6jrAcBNkGia26G36TulfwJWUa1NmjJekxxOWu7op5MICDAGTUJqAgWpVz xl7Gsf1gw2ls0XUoE02qbRZ/rEM/OxIB+IecxKX+b7wyKgE0vLLri3vtZh03ofk8qWpI QpCQ== X-Gm-Message-State: APjAAAUjH6cCPTu6clSeG75U74m2WGz8cU4GUkPN/YGnjsbdIwsOSuW9 l6bSv+zhGTX9zQTqDhhPr1aG3EJO X-Google-Smtp-Source: APXvYqzAEadXiBSjKdnEs2JOrhcdUr1sFLZlb/yTtf9gxDHl3sUCOjKShf8w6SrQ3Cx2RjS1PmL6Rg== X-Received: by 2002:ac2:5088:: with SMTP id f8mr9076773lfm.163.1576245741852; Fri, 13 Dec 2019 06:02:21 -0800 (PST) Received: from jonathartonsmbp.lan (83-245-229-102-nat-p.elisa-mobile.fi. [83.245.229.102]) by smtp.gmail.com with ESMTPSA id a21sm4643075lfg.44.2019.12.13.06.02.20 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 13 Dec 2019 06:02:21 -0800 (PST) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.1\)) From: Jonathan Morton In-Reply-To: <1d359153abfc413b4f61c647437427d6@slashdirt.org> Date: Fri, 13 Dec 2019 16:02:19 +0200 Cc: cake@lists.bufferbloat.net Content-Transfer-Encoding: quoted-printable Message-Id: <8FC615C8-4885-4F0A-B2EE-934DC4E806E8@gmail.com> References: <1d359153abfc413b4f61c647437427d6@slashdirt.org> To: Thibaut X-Mailer: Apple Mail (2.3445.9.1) Subject: Re: [Cake] Trouble with CAKE 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: Fri, 13 Dec 2019 14:02:23 -0000 > On 13 Dec, 2019, at 3:43 pm, Thibaut wrote: >=20 > I've been using CAKE on my DSL-connected Linux router for the last few = years, and it worked well until very recently. Two things happened: >=20 > 1) My ISP (French "Free") switched my DSLAM to native IPv6, which for = the time being means that I had to revert to using their set-top-box = (Freebox) instead of the VDSL2 model I was using in bridge mode until = then (CAKE in "bridged-ptm ether-vlan" mode) > 2) I upgraded my router from 3.16 (Devuan Jessie) to 4.9 (Devuan = ASCII) >=20 > Since then, no matter which setup I use, I cannot get CAKE to work as = intended. Specifically, any long-standing best effort stream (such as a = remote rsync) will be throttled to a near grinding halt even though = there is no other significant traffic going on. Some random bursts can = be seen (with iftop) but nothing ever gets close to half the maximum = bandwidth. This is notably affecting the OpenWRT buildbots I'm hosting = on this link. Old kernels, including 4.9 series, tend to be more problematic than the = latest ones. If you can, I would recommend updating to a 5.x series = kernel, in which Cake is an upstream feature. I won't presume to guess = how best to achieve that with your distro. The good news is that Free.fr is among the relatively few ISPs who have = actively tackled bufferbloat themselves. As a workaround while you sort = this out, you should get reasonable performance just from using the = Freebox directly. - Jonathan Morton=