From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from iramx2.ira.uni-karlsruhe.de (iramx2.ira.uni-karlsruhe.de [141.3.10.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id CF3D73CB36 for ; Tue, 27 Nov 2018 06:53:16 -0500 (EST) Received: from i72vorta.tm.uni-karlsruhe.de ([141.3.71.26] helo=i72vorta.tm.kit.edu) by iramx2.ira.uni-karlsruhe.de with esmtp port 25 iface 141.3.10.81 id 1gRbvS-0006vq-K8; Tue, 27 Nov 2018 12:53:10 +0100 Received: from [IPv6:::1] (ip6-localhost [IPv6:::1]) by i72vorta.tm.kit.edu (Postfix) with ESMTPS id 90D18420DD3; Tue, 27 Nov 2018 12:53:10 +0100 (CET) To: Luca Muscariello , Mikael Abrahamsson Cc: Jonathan Morton , bloat References: <65EAC6C1-4688-46B6-A575-A6C7F2C066C5@heistp.net> <86b16a95-e47d-896b-9d43-69c65c52afc7@kit.edu> From: "Bless, Roland (TM)" Openpgp: preference=signencrypt Autocrypt: addr=roland.bless@kit.edu; prefer-encrypt=mutual; keydata= xsFNBFi0OxABEACy2VohJ7VhSu/xPCt4/6qCrw4Pw2nSklWPfAYEk1QgrbiwgvLAP9WEhAIU w45cojBaDxytIGg8eaYeIKSmsXjHGbV/ZTfo8r11LX8yPYR0WHiMWZpl0SHUd/CZIkv2pChO 88vF/2FKN95HDcp24pwONF4VhxJoSFk6c0mDNf8Em/Glt9BcWX2AAvizTmpQDshaPje18WH3 4++KwPZDd/sJ/hHSXiPg1Gdhs/OG/C0CJguOAlqbgSVAe3qKOr1M4K5M+wVpsk373pXRfxd7 ZAmZ05iBTn+LfgVcz+AfaKKcsWri5CdTT+7JDL6QNQpox+b5FXZFSHnEIST+/qzfG7G2LqqY mml6TYY8XbaNyXZP0QKncfSpRx8uTRWReHUa1YbSuOxXYh6bXpcugD25mlC/Lu0g7tz4ijiK iIwq9+P2H1KfAAfYyYZh6nOoE6ET0TjOjUSa+mA8cqjPWX99kEEgf1Xo+P9fx9QLCLWIY7zc mSM+vjQKgdUFpMSCKcYEKOuwlPuOz8bVECafxaEtJJHjCOK8zowe2eC9OM+G+bmtAO3qYcYZ hQ/PV3sztt/PjgdtnFAYPFLc9189rHRxKsWSOb4xPkRw/YQAI9l15OlUEpsyOehxmAmTsesn tSViCz++PCdeXrQc1BCgl8nDytrxW+n5w1aaE8aL3hn8M0tonQARAQABzShSb2xhbmQgQmxl c3MgKFRNKSA8cm9sYW5kLmJsZXNzQGtpdC5lZHU+wsGABBMBCAAqAhsDBQkSzAMABQsJCAcC BhUICQoLAgQWAgMBAh4BAheABQJYtYdHAhkBAAoJEKON2tlkOJXuzWkP+wfjUnDNzRm4r34a AMWepcQziTgqf4I1crcL6VD44767HhyFsjcKH31E5G5gTDxbpsM4pmkghKeLrpPo30YK3qb7 E9ifIkpJTvMu0StSUmcXq0zPyHZ+HxHeMWkosljG3g/4YekCqgWwrB62T7NMYq0ATQe1MGCZ TAPwSPGCUZT3ioq50800FMI8okkGTXS3h2U922em7k8rv7E349uydv19YEcS7tI78pggMdap ASoP3QWB03tzPKwjqQqSevy64uKDEa0UgvAM3PRbJxOYZlX1c3q/CdWwpwgUiAhMtPWvavWW Tcw6Kkk6e0gw4oFlDQ+hZooLv5rlYR3egdV4DPZ1ugL51u0wQCQG9qKIMXslAdmKbRDkEcWG Oi2bWAdYyIHhhQF5LSuaaxC2P2vOYRHnE5yv5KTV3V7piFgPFjKDW+giCRd7VGfod6DY2b2y zwidCMve1Qsm8+NErH6U+hMpMLeCJDMu1OOvXYbFnTkqjeg5sKipUoSdgXsIo4kl+oArZlpK qComSTPhij7rMyeu/1iOwbNCjtiqgb55ZE7Ekd84mr9sbq4Jm/4QGnVI30q4U2vdGSeNbVjo d1nqjf3UNzP2ZC+H9xjsCFuKYbCX6Yy4SSuEcubtdmdBqm13pxua4ZqPSI0DQST2CHC7nxL1 AaRGRYYh5zo2vRg3ipkEzsFNBFi0OxABEAC2CJNp0/Ivkv4KOiXxitsMXZeK9fI0NU2JU1rW 04dMLF63JF8AFiJ6qeSL2mPHoMiL+fG5jlxy050xMdpMKxnhDVdMxwPtMiGxbByfvrXu18/M B7h+E1DHYVRdFFPaL2jiw+Bvn6wTT31MiuG9Wh0WAhoW8jY8IXxKQrUn7QUOKsWhzNlvVpOo SjMiW4WXksUA0EQVbmlskS/MnFOgCr8q/FqwC81KPy+VLHPB9K/B65uQdpaw78fjAgQVQqpx H7gUF1EYpdZWyojN+V8HtLJx+9yWAZjSFO593OF3/r0nDHEycuOjhefCrqr0DDgTYUNthOdU KO2CzT7MtweRtAf0n27zbwoYvkTviIbR+1lV1vNkxaUtZ6e1rtOxvonRM1O3ddFIzRp/Qufu HfPe0YqhEsrBIGW1aE/pZW8khNQlB6qt20snL9cFDrnB6+8kDG3e//OjK1ICQj9Y/yyrJVaX KfPbdHhLpsgh8TMDPoH+XXQlDJljMD0++/o7ckO3Sfa8Zsyh1WabyKQDYXDmDgi9lCoaQ7Lf uLUpoMvJV+EWo0jE4RW/wBGQbLJp5usy5i0fhBKuDwsKdLG3qOCf4depIcNuja6ZmZHRT+3R FFjvZ/dAhrCWpRTxZANlWlLZz6htToJulAZQJD6lcpVr7EVgDX/y4cNwKF79egWXPDPOvQAR AQABwsFlBBgBCAAPBQJYtDsQAhsMBQkSzAMAAAoJEKON2tlkOJXukMoP/jNeiglj8fenH2We 7SJuyBp8+5L3n8eNwfwY5C5G+etD0E6/lkt/Jj9UddTazxeB154rVFXRzmcN3+hGCOZgGAyV 1N7d8xM6dBqRtHmRMPu5fUxfSqrM9pmqAw2gmzAe0eztVvaM+x5x5xID2WZOiOq8dx9KOKrp Zorekjs3GEA3V1wlZ7Nksx/o8KZ04hLeKcR1r06zEDLN/yA+Fz8IPa0KqpuhrL010bQDgAhe 9o5TA0/cMJpxpLqHhX2As+5cQAhKDDsWJu3oBzZRkN7Hh/HTpWurmTQRRniLGSeiL0zdtilX fowyxGXH6QWi3MZYmpOq+etr7o4EGGbm2inxpVbM+NYmaJs+MAi/z5bsO/rABwdM5ysm8hwb CGt+1oEMORyMcUk/uRjclgTZM1NhGoXm1Un67+Rehu04i7DA6b8dd1H8AFgZSO2H4IKi+5yA Ldmo+ftCJS83Nf6Wi6hJnKG9aWQjKL+qmZqBEct/D2uRJGWAERU5+D0RwNV/i9lQFCYNjG9X Tew0BPYYnBtHFlz9rJTqGhDu4ubulSkbxAK3TIk8XzKdMvef3tV/7mJCmcaVbJ2YoNUtkdKJ goOigJTMBXMRu4Ibyq1Ei+d90lxhojKKlf9yguzpxk5KYFGUizp0dtvdNuXRBtYrwzykS6vB zTlLqHZ0pvGjNfTSvuuN Organization: Institute of Telematics, Karlsruhe Institute of Technology Message-ID: <4ca89040-69cf-b429-d522-b0eac22b9f7b@kit.edu> Date: Tue, 27 Nov 2018 12:53:10 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: 8bit X-ATIS-AV: ClamAV (iramx2.ira.uni-karlsruhe.de) X-ATIS-Timestamp: iramx2.ira.uni-karlsruhe.de 1543319590.671978091 Subject: Re: [Bloat] when does the CoDel part of fq_codel help in the real world? X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Nov 2018 11:53:17 -0000 Hi Luca, Am 27.11.18 um 12:01 schrieb Luca Muscariello: > A BDP is not a large buffer. I'm not unveiling a secret. That depends on speed and RTT (note that typically there are several flows with different RTTs sharing the same buffer). The essential point is not how much buffer capacity is available, but how much is actually used, because that adds queueing delay. > And it is just a rule of thumb to have an idea at which working point > the protocol is working. No, one can actually prove that this is the best size for loss-based CC with backoff factor of 0.5 (assuming a single flow). > In practice the protocol is usually working below or above that value. That depends on the protocol. > This is where AQM and ECN help also. So most of the time the protocol is > working at way  > below 100% efficiency. > My point was that FQ_codel helps to get very close to the optimum w/o > adding useless queueing and latency. > With a single queue that's almost impossible. No, sorry. Just impossible. No, it's possible. Please read the TCP LoLa paper. Regards, Roland