From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lj1-x244.google.com (mail-lj1-x244.google.com [IPv6:2a00:1450:4864:20::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 2DBE53BA8E for ; Sun, 12 Aug 2018 09:41:04 -0400 (EDT) Received: by mail-lj1-x244.google.com with SMTP id u7-v6so10570869lji.3 for ; Sun, 12 Aug 2018 06:41:04 -0700 (PDT) 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=p3mESk86Fol5RgREKxTOljc+07ayxEQ8OEVHQsxk+rs=; b=U5qZ3H2fpntbR6Zd9KZ5m9AN5mWz7GKhGriTXdVv3piRITCx09yK7vgW7DIAqrmsAE vv7X4gSd+FKnlzYkVoVuOVElaQHxyiX4q8/UPhTQsLk8VkkbJEY0g2aKtepmzAEFQU4F F2vdCSKNTVv1diMqrE7zXP1pS7dGxIxb7IChYXgJ4AiFKsPtXOO943k/IzYVrAUogiCC kfyWPjXPsF6VnRV0n5E3iknZinpxv+j+8ja/qoB6nHRdIELkI1obI10VGIMEFKf0RzEt ynP8L5P3+0moDfls/FtE05oCdksViZFMlb94JVMhf7OcEcWS9K3VESX54sDTT7sck3UI fJNw== 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=p3mESk86Fol5RgREKxTOljc+07ayxEQ8OEVHQsxk+rs=; b=tJWu+eWsd5e1PK6OrEaGQWo4bIpQFdGxuAecUzZbvacIsPxyTDE5pmWBhIsJEsiZvS EUX/JeFuSj5aCuX+VAa5rK8FkwbwsdqmlRHH0c4mLnO6hcrxYgvtzHetHDc5rwN+7X8H wkbSz/62qnDU43N2b8/epVJGbufx1ggu39znybLBcPaGzPmfNNmfXEfbQA2yGBnBSgZi /SqFTN2155IhHJtFYjOsQRoPiLFkNqVHoosMGFuzVXZV6VX3APgIuTWDfz7VcLorRNMW D6srzR72Qdw9w2EDwQMgOXQakCqQ+SCTJ/mk+KNbegVAArjgq2RNsPe4cwZYpfLs5zbe fl/g== X-Gm-Message-State: AOUpUlHwvfW3AaDW5rh9wK8a4FcStQMvfPA6EJDYVUxRvKFqS9DF1wSZ x4R29z1NcAcIt5cormU2TkjI4YA5 X-Google-Smtp-Source: AA+uWPwDDOCzlZ9T71n11OLD/2KUCG/EQ1HvXD1D0UOFQPdE24I1nI2on+VJJz0qT6mQCdL+OkopPw== X-Received: by 2002:a2e:9883:: with SMTP id b3-v6mr9368464ljj.80.1534081263012; Sun, 12 Aug 2018 06:41:03 -0700 (PDT) Received: from jonathartonsmbp.lan (83-245-238-47-nat-p.elisa-mobile.fi. [83.245.238.47]) by smtp.gmail.com with ESMTPSA id i15-v6sm2883641lfb.94.2018.08.12.06.41.01 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 12 Aug 2018 06:41:02 -0700 (PDT) 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: Date: Sun, 12 Aug 2018 16:41:00 +0300 Cc: Cake List Content-Transfer-Encoding: quoted-printable Message-Id: References: To: Pete Heist X-Mailer: Apple Mail (2.3445.9.1) Subject: Re: [Cake] issue with Cake and bpf filter 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: Sun, 12 Aug 2018 13:41:04 -0000 > On 12 Aug, 2018, at 1:23 pm, Pete Heist wrote: >=20 > One more thing to add to this, when working with another bpf filter = which is relatively similar to this simple one (although has some more = innocuous looking code like map lookups and read-only operations on the = skb) sometimes the attached is suddenly and repeatedly sent to both = syslog and kern.log until the disk fills up... > Aug 12 09:57:25 ubuntu kernel: [ 2408.152975] WARNING: CPU: 3 PID: = 2304 at /home/a/src/sch_cake/sch_cake.c:2094 cake_dequeue+0x791/0xc70 = [sch_cake] > WARN_ON(host_load > CAKE_QUEUES); Yeah, something is going seriously wrong here. It shouldn't be possible = for that warning to trigger; if it is, then Cake's internal data = structures are being corrupted somehow. But Cake doesn't directly read tc_classid from an skb. So what could it = be influencing? - Jonathan Morton