From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp84.iad3a.emailsrvr.com (smtp84.iad3a.emailsrvr.com [173.203.187.84]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id DA9C93B2A4 for ; Fri, 15 Oct 2021 12:46:18 -0400 (EDT) X-Auth-ID: jf@jonathanfoulkes.com Received: by smtp27.relay.iad3a.emailsrvr.com (Authenticated sender: jf-AT-jonathanfoulkes.com) with ESMTPSA id 73A7924906 for ; Fri, 15 Oct 2021 12:46:18 -0400 (EDT) From: Jonathan Foulkes Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.120.0.1.13\)) Message-Id: <47985A3A-FD43-4AA2-A757-9A0214B3DA44@jonathanfoulkes.com> Date: Fri, 15 Oct 2021 12:46:17 -0400 To: cake@lists.bufferbloat.net X-Mailer: Apple Mail (2.3654.120.0.1.13) X-Classification-ID: 8722f34f-81da-4b85-a675-3df0731b1895-1-1 X-Mailman-Approved-At: Mon, 18 Oct 2021 08:18:32 -0400 Subject: [Cake] Cake diffserv3 stalling when all ingress marked with CS1 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, 15 Oct 2021 16:46:18 -0000 Hi Everyone,=20 It looks like the little issue with some ISPs re-marking all inbound (to = the modem) traffic with CS1 is cropping up randomly. This is causing what seems to be a bug in Cake with a multi-tier config = (diffserv3 in this case). I have some users on lines that had been working fine for years with = various iterations of Cake, but all of the sudden, in the past two = weeks, started showing strange issues with large delays every couple of = seconds and even lockups on traffic flowing on the LAN (the router UI = was not reachable). Turns out that=E2=80=99s about when the ISP started remarking everything = with CS1. Switching cake to best-effort mode (single-tin) fixes the issue, as does = disabling QoS altogether. We can also make difserv3 work by enabling the =E2=80=98strip dscp on = inbound=E2=80=99 (wash) option. My question is: why does cake lock up or have regular hiccups if all = inbound traffic is CS1? Platform is OpenWRT 19.07.6 on a MT7621/7603 router with 512MB of RAM. Jonathan Foulkes