From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-x235.google.com (mail-wm0-x235.google.com [IPv6:2a00:1450:400c:c09::235]) (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 10BE73B2A4 for ; Mon, 4 Sep 2017 22:46:12 -0400 (EDT) Received: by mail-wm0-x235.google.com with SMTP id v2so12654366wmf.0 for ; Mon, 04 Sep 2017 19:46:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:subject:to:message-id:date:user-agent:mime-version :content-transfer-encoding:content-language; bh=lsXxg41n5P246CS2w2pw5v0orUzMjNPBigsIb2cWpQ8=; b=bJ48zNXjE8tDLQuziQ4ToUMo+Gq8KH19/L+cOb4Xk4aZWl7ycgfV7FhN+bwBzQu3xf soPvemR7wY3MnqUSgL2J7gAMy9hg0f1Rl6G4vq5YCgTIDGYZG6vS6cUJx+RZY9aCyi4Z vgWOZNgyDB6VZYd4/NLAUAnfktl7MRjLsH12RPmhdS03Le2JIP4qtwIRkuoE7wWolqB0 iE3dkSaaysF1A6/j6wacwjw4wjMOtgb+nTULLJ3TkD/tkTG4ZZ4DyVED9rXwYvW9w9vA SC/VJEj2ouc3vVlR6rhN+gIf8xG5zCJyKT7J5kn7xDzOO5eIin61bXpJMug2weU4pc7e E+lA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:subject:to:message-id:date:user-agent :mime-version:content-transfer-encoding:content-language; bh=lsXxg41n5P246CS2w2pw5v0orUzMjNPBigsIb2cWpQ8=; b=lslAU5n7AHOiwrwxgMv6My1Zzaer1u4a1h/+SoxlyX6XQzbD1pWaeXFGGJob9wwBPO xUoqXg3npK3RlPYhhilaUsZmRzOJjdu95Nk/c4jWQ4j+orJxGatw3V7fq2tsLkTcgser a366PF/XUy25brt4PTAN7hUKNxRwIxI7ULWQVZTzdCo9G38gi8t7dW/rnugJSj7OPLBG KQV9VlqUFF5aAKFDlISu0SRK5p1FpGWFm1d9/IiAwLE3X6VDvYh2MfAVboG1++7joEO4 6x4gnIWmQUXwNzjb22QVK+s57QUv4v83w2dFoBIMsxE1FqdrNGArNPO2MH/f/1/h8/Yj SSVA== X-Gm-Message-State: AHPjjUjvh+WgqDPqoN3LUT6LLVKMp6FCHD3emonBD2Fy15Nh97opKQLk CquDWj1btD6BDYsq3js= X-Google-Smtp-Source: ADKCNb5FHAiFjPUxMVlyub9oHFsuR8QmZEczAI3p0DdsWskdsjpm5NSAUQK/KXmVMxQ55p1R15iPRQ== X-Received: by 10.28.95.86 with SMTP id t83mr1462110wmb.194.1504579571868; Mon, 04 Sep 2017 19:46:11 -0700 (PDT) Received: from [192.168.0.1] (ip-37-24-197-30.hsi14.unitymediagroup.de. [37.24.197.30]) by smtp.gmail.com with ESMTPSA id x76sm1779169wma.36.2017.09.04.19.46.10 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 04 Sep 2017 19:46:11 -0700 (PDT) From: Dennis Fedtke To: cake@lists.bufferbloat.net Message-ID: Date: Tue, 5 Sep 2017 04:46:09 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Subject: [Cake] overhead and mpu 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: Tue, 05 Sep 2017 02:46:13 -0000 Hi! what values should be used for an Ethernet connection running over docsis modem? I think cake automatically accounts for the Ethernet header. But how large is the ethernet header? Some sites say 1514 some other sites say 1518. So we have the mac header (14bytes) + the crc checksum (4 bytes) + max payload 1500bytes = 1518 bytes? I looked at the code and there is hard_header_len used. After some quick googling i found this info: The value ofhard_header_lenis14(ETH_HLEN) for Ethernet interfaces. Which "packets size(1500 or 1514 or 1518)" does cake really see and work with when running on an Ethernet interface? Minimum Ethernet payload size is 46 bytes. So should i use mpu 46, mpu 60 or mpu 64 setting for an Ethernet interface? Thanks