From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from vps.slashdirt.org (vps.slashdirt.org [144.91.108.218]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id AA2223CB48 for ; Fri, 13 Dec 2019 17:39:34 -0500 (EST) Received: from tama.lan (unknown [37.172.203.59]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by vps.slashdirt.org (Postfix) with ESMTPSA id 5E2FE603EB; Fri, 13 Dec 2019 23:39:33 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 vps.slashdirt.org 5E2FE603EB DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=slashdirt.org; s=mail; t=1576276773; bh=9Sfz1xxPdfjNufGosyQB0qfYBwrtwy93mnxINB67w8s=; h=Subject:From:In-Reply-To:Date:Cc:References:To:From; b=rvNkfp/y5csz8YWz1mgqZttoUExKU0UJi7JO9Oi1WA5F/4GVSDQkP+XYB3BTwkjuH 5a41lB9at4O59nMt68sdMCf5JgRyJbLgqNHk0Ubo4Tlntfd/TOEHmEYGbpMoCw+QU0 9cu4ZqFslFy0GH0mBm9iJCSv1SwRUOu+V2ywMTaU= Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) From: Thibaut In-Reply-To: <8FC615C8-4885-4F0A-B2EE-934DC4E806E8@gmail.com> Date: Fri, 13 Dec 2019 23:39:32 +0100 Cc: cake@lists.bufferbloat.net Content-Transfer-Encoding: quoted-printable Message-Id: <6E9587F7-C208-4568-8429-AEBA9E694E24@slashdirt.org> References: <1d359153abfc413b4f61c647437427d6@slashdirt.org> <8FC615C8-4885-4F0A-B2EE-934DC4E806E8@gmail.com> To: Jonathan Morton X-Mailer: Apple Mail (2.3445.104.11) 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 22:39:34 -0000 Hi Jonathan, > On 13 Dec 2019, at 15:02, Jonathan Morton = wrote: >=20 >> 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. >=20 > 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. I=E2=80=99m now able to confirm this looks like a regression: I was able = to retrieve and build the last known working version of CAKE on my = router, and with an adjusted overhead of 48 atm (confirmed thanks to the = help of Stephan), it works like a charm. Current HEAD doesn=E2=80=99t, = with the exact same parameters. I=E2=80=99ll try to bisect, see if I can isolate the culprit. HTH, Thibaut=