From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr0-x236.google.com (mail-wr0-x236.google.com [IPv6:2a00:1450:400c:c0c::236]) (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 A01503B29E for ; Tue, 5 Sep 2017 16:19:44 -0400 (EDT) Received: by mail-wr0-x236.google.com with SMTP id a47so8971220wra.1 for ; Tue, 05 Sep 2017 13:19:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-transfer-encoding:content-language; bh=W4tHpsjAekbN/Wfm15l0WlmKuiQ+2p39OOwtfiJcRYw=; b=ki1mHOCWA5InsW4G2Ode+MsehpU91GcNJZxjud7FENtdgQr0XV1YD57C4jBBBZFeXC wK1/5CrhjkDUmb+YwTgxBmzTJikIbZsOFsAGET7G9+BD2sI2EGdYmAT3KspZlhYhbvZU MUQrIGOvTmT3nTFqvUvPyjLxQNxSE5csq9wicPGPqhTqSGnxlaBVLK/AQbTfpzyEzrOW DxkAimgRCndlrdUyAwUcEiaYxNihFXGsajoTkqFCL/4k081Oe9JAQuMsCoEeHVtoFX/g z7rspK6vjVhAgiFTrz+12HSemGUFsinlNHWppalEAp3fPt3e607A/OnhPTP24Rj6cDfo Ym2g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding :content-language; bh=W4tHpsjAekbN/Wfm15l0WlmKuiQ+2p39OOwtfiJcRYw=; b=DSOUUYl9PWMlEXlTBvZUEWg7ukR6KhdA5y83fDqcc3Ci5xroeiJwdaR1/tpgpq2u0F qqq3McitqY4dNUsPN3/OD8U0H+j5Pgw78uGdR5O+WVx2c4HUDQgSYW2ANguvGXLyt8YB dTLcDKlXamsfJ92kiQ+KkWlR3tsE8IgDrFqzAfruX1Of/8Aq6UFXmzSmNGwdS8xCh4kt oZ6Y/WYuSl2fBE4lKyg2eZjLb9kgN5KAbjzwzeJzegETSDpV2iYLQLNrPAZQ+CFSCWCs AxIxaFr9lojlwvFiwL4ihRGlWdx/9DGbkW90YbCP04vJcGvXL7cssAJS49sDG2PXOqHn qFkA== X-Gm-Message-State: AHPjjUiFF3W8soUqbYsv4XxX92UFhe9uOC5j2KVMff0mQmxQk5xVkmR6 U2CGsb3ou919dAt3KpM= X-Google-Smtp-Source: ADKCNb6+0tPdRMYxMEZO/+NDJArc7miHFVL66xvEzp6h7CavRE3K8+HM1KhY12hizQUVYAhPxpHDFg== X-Received: by 10.223.160.23 with SMTP id k23mr175207wrk.212.1504642783439; Tue, 05 Sep 2017 13:19:43 -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 u19sm965525wmd.37.2017.09.05.13.19.42 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 05 Sep 2017 13:19:42 -0700 (PDT) To: Jonathan Morton Cc: Cake List References: From: Dennis Fedtke Message-ID: <915b0913-0ac5-c6b6-3771-752a9e41dff2@gmail.com> Date: Tue, 5 Sep 2017 22:19:40 +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 20:19:44 -0000 Hi! Thank you for all answers. But for me this still makes no sense. Assuming we have an ethnernet connection running over a docsis line. docsis is able to transmit full 1500byte ethernet packets. Lets say it is an 50 Mbit/s Line. (I dont know now how exactly docsis works) So to reach the 50Mbit/s ethernet speed the docsis link rate needs to be higher 50,6 Mbit/s (50*1518/1500 ??) But when running a speedtest it will still not show the full speed. because of other overhead from underlying protocols (tcp/ip for example) So the ISP will set the sync rate even higher to compensate for that. But does this matter for the end user? In case of docsis does it make sense to account for 18 overhead? The user will enter 50mbit and it will work. If the isp has provided a sligher higher syncrate. and the mpu setting. i don't know how cake handles this in detail. How the overhead gets added. lets i enter mpu 46. And cake we set 18 as overhead. Will this result in mpu 46 or 64? Can someone debug the code maybe please? :> I have the feeling with mpu 46 my pages lot a bit snappier. but could be placebo. Thank you.