From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf0-x22f.google.com (mail-lf0-x22f.google.com [IPv6:2a00:1450:4010:c07::22f]) (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 4501A3B29E for ; Fri, 1 Jun 2018 13:49:13 -0400 (EDT) Received: by mail-lf0-x22f.google.com with SMTP id o9-v6so15995260lfk.1 for ; Fri, 01 Jun 2018 10:49:13 -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=Vq5jU8DrpaFu0wstulILlQN+w7yxtyWiWOqn29YJIHk=; b=mhaBk7dReBCpQ+kfUOI4MnMwlVwL5yfguv6U5iQBNW6fZ5pAJbACO1HDB4e0utcjw5 MqAvGltWZqQHxmVZZJmpU2RxScII8OQ8YVsImCEHnf9f9V9G/MPR4F/4kIsH8L7P5OzK 8bbst0qlZAfzbSWH9xS5emhWBQPw2gGmpfUpxH/wB/tABcFCFPHCBSXA0w7GATMM7lrr JJ/fVW5vCtwSvYvkNmDSfneqO/fpZLV/enFK0Mth335IsSLNj2gGL96LSOOt43lq+JQK EtKMH2UVOYMi0FqgBiWXgcd3YTZHgUXVLRFTBs5qIgwUpfd9jmZpf07GuVlXC5LvRJU9 FjpQ== 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=Vq5jU8DrpaFu0wstulILlQN+w7yxtyWiWOqn29YJIHk=; b=CenfzvFX926yob+PA46LjQS3EZR4zQ6bgOBE0icc+o275XqXI5e0n8CC+ZxAEX15b1 VDYvkpgA44Xp89wI3FzL19k6ViIiNolrBX8v6OhdcYqrZg1QELrc2aFSpgPLjqB2Z2IS aNyg0YgWsATNavN6YIFgsqg2e/XtZDLesjEvxTtBuYrHhxdEbA5dllhGYQGvShZ+9UNR +OG1e8LKqfUdF3KNUCeJI1JUzClgNNWTyX88gF+0amz12DHtWH9PsOsnCPDsc/2DE8MX y0iZej2WpUDIboMFZTH0iZceuvaNxumoUe2vKC652/WtvrQd+Cehz8PmxMgMbQqRSYVp nXLA== X-Gm-Message-State: ALKqPwcmhmaiNmyrkZcm2AAxEjYvO+poM4F559YI05I6lU2Vb0B0ftFi piTH78S6fjQErQv1TaqZ1e0= X-Google-Smtp-Source: ADUXVKJQmbn8evvLKcZD7tZNiqTzjq6VQ9XStbxOIjQjp8PHGVAeHJzLlLFwlWLur5j9fbOvpkQ3wg== X-Received: by 2002:a19:9390:: with SMTP id w16-v6mr7637737lfk.70.1527875351627; Fri, 01 Jun 2018 10:49:11 -0700 (PDT) Received: from [192.168.239.216] (83-245-233-104-nat-p.elisa-mobile.fi. [83.245.233.104]) by smtp.gmail.com with ESMTPSA id e7-v6sm8265889ljj.95.2018.06.01.10.49.10 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 01 Jun 2018 10:49:11 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 11.3 \(3445.6.18\)) From: Jonathan Morton In-Reply-To: <87muwe9z7j.fsf@toke.dk> Date: Fri, 1 Jun 2018 20:49:09 +0300 Cc: cake@lists.bufferbloat.net Content-Transfer-Encoding: quoted-printable Message-Id: References: <87muwe9z7j.fsf@toke.dk> To: =?utf-8?Q?Toke_H=C3=B8iland-J=C3=B8rgensen?= X-Mailer: Apple Mail (2.3445.6.18) Subject: Re: [Cake] Lockup at high speeds 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, 01 Jun 2018 17:49:13 -0000 > On 1 Jun, 2018, at 8:46 pm, Toke H=C3=B8iland-J=C3=B8rgensen = wrote: >=20 > As you may have seen, I hit a lockup bug when testing Cake at high > speeds. I am not quite sure what is happening, but we seem to be = looping > forever either in cake_dequeue() or cake_enqueue(), causing deadlocks. >=20 > Unfortunately, I have no more time to debug this for now. As far as I > can tell, it only seems to be happening as the shaped rate approaches = or > exceeds the link speed, or when running in unlimited mode. So for all = I > know it might be possible to trigger it at lower speeds as well... >=20 > Anyone with any bright ideas? Is there a complete copy of the code somewhere I can look at it? I'm = still running the cobalt branch. - Jonathan Morton