From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr0-x22f.google.com (mail-wr0-x22f.google.com [IPv6:2a00:1450:400c:c0c::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 731BF3B2A4 for ; Tue, 5 Sep 2017 02:00:08 -0400 (EDT) Received: by mail-wr0-x22f.google.com with SMTP id 108so5932884wra.5 for ; Mon, 04 Sep 2017 23:00:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:from:to:references:message-id:date:user-agent:mime-version :in-reply-to:content-transfer-encoding:content-language; bh=qBhTaNLsUI37lTtqdbBK9E3IAKG43saVq/r7Fa4b7bI=; b=d1XTLkPUU6Aqq+0hTarZK29mOHF6kNl8DMIuoCjSFr3jN6PRkgpo2+TxBWMzpiTfnV vP5zGKvMRELMTo401fJQaPEE/YdgWzith1n6g0aUTViF4l3F6bqggFmolPDQOOwnt1VU mA8Jt0miyjT41Dm+Wlfa3DJ/SWhTTDRDDWPy0AHSyeBuzT8sLpO2W4wqihLo5LUB5CAf D3M4TXDhzsnUo876hxQXeBXf7qjC3Mu6XzG0af38/ZEut59+Jez4vCbeVf5eywxg/fRt 7n+O5ciIgriyp6WIYoxIwVW4yEQFUScL4PR3UCj+16paRACsZDBoRBTOHN5UtQaFLZgv VN5A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:from:to:references:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding :content-language; bh=qBhTaNLsUI37lTtqdbBK9E3IAKG43saVq/r7Fa4b7bI=; b=a3Dx+ClFUj+2BOOrLuMT0EpC1CDCXki4C3mtbfjyURJm5+pLYgrIRzG1su+/86MYE1 wpjf9R7OKNm3JN+iXGqU1iOCMENKU7IV4JYDychTKQm1imdtMLQxdQgp/DZDyT4kGj9F Z8YOmJCV6Vh47NVJF2ttpVNFLIu//g6vweMScPlRKMGM4rAup9RRPSKSatoDuTgM86tD V/b39IVPhRCrRAEw4O4TyuksA2O+1qbWAfiQL2IvgWLzyOL8zyPEOA08wFnqDn6oLWlp Zttq/241DthU3YoS+cvBsSNjUTgIBAujTBgIsYWpr+WDm9Kfao0s0LGgOE3dMLH4ElEB unRw== X-Gm-Message-State: AHPjjUjjrk3kbm1FNNc6O01aqmLaUkYN74qmD+DltrXzvGYiXGVh1FAj ZYX6+MvUS1yGAdKFXpA= X-Google-Smtp-Source: ADKCNb6DHcil97LYxaHeUlpkeqlwbCHn89HRgudAVFc54XBNK2xkWubcvQ8btGRvixa+4Q34nv4psQ== X-Received: by 10.223.129.76 with SMTP id 70mr1559110wrm.65.1504591206661; Mon, 04 Sep 2017 23:00:06 -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 x81sm5282634wmd.5.2017.09.04.23.00.06 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 04 Sep 2017 23:00:06 -0700 (PDT) From: Dennis Fedtke To: cake@lists.bufferbloat.net References: Message-ID: Date: Tue, 5 Sep 2017 08:00:04 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Subject: Re: [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 06:00:08 -0000 Hi Ryan, Thanks for you answers. Lets assume again ethernet over docsis connection at 50 Mbit/s. So to get 50 Mbit/s ethernet perfomance, the docsis link speed needs to be set at a higher link speed to compensate for the 18 header ethernet overhead, or? or Assuming: The docsis link syncs at exactly 50Mbit/s. When cake is set to exactly 50Mbit/s, it is actually set at a higher speed then the link actually is. For mpu why 64? I assume minimum 46bytes ethernet payload + 18bytes header? But why does cake use hard_header_len for the header size which is 14 bytes? I don't know how packet sheduler system works, but maybe it is not needed to include the ethernet header. cake does work on ip pakets or? so this is layer3 i think. the hole thing with ethernet headers is happening in layer2. This would change the minimum packet size to 46 or? Thanks.