From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.sysmocom.de (mail.sysmocom.de [144.76.43.93]) by lists.bufferbloat.net (Postfix) with ESMTPS id 3F23B3ECF9 for ; Mon, 21 Dec 2015 03:59:02 -0500 (EST) Received: from [10.9.1.105] (ip5b418565.dynamic.kabel-deutschland.de [91.65.133.101]) by mail.sysmocom.de (Postfix) with ESMTPSA id 35CA81E0765 for ; Mon, 21 Dec 2015 08:58:59 +0000 (UTC) To: codel@lists.bufferbloat.net From: Jacob Erlbeck X-Enigmail-Draft-Status: N1110 Message-ID: <5677BF53.2040209@sysmocom.de> Date: Mon, 21 Dec 2015 09:58:59 +0100 User-Agent: Mozilla/5.0 (X11; Linux i686; rv:38.0) Gecko/20100101 Thunderbird/38.4.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Subject: [Codel] CoDel and GPRS in osmo-pcu X-BeenThere: codel@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: CoDel AQM discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 21 Dec 2015 08:59:02 -0000 Hello, just for your information: we have added active queue management based on CoDel to the osmo-pcu project (https://openbsc.osmocom.org/trac/wiki/osmo-pcu), which is an open source software based GPRS-only PCU implementation. The implementation is based on http://queue.acm.org/appendices/codel.html but is deployed as a time stamp based automaton. It is being applied independently per mobile station (phone) in downlink direction only. The goal was to have PCU based AQM as a last resort if BSSGP flow control is not sufficient. Since the IP packets are eventually split and encapsulated within LLC frames which are generally encrypted, the PCU is not an optimal place to do AQM. Nevertheless it improves the TCP "experience" and downlink ping latencies under load significantly. Kind regards Jacob -- - Jacob Erlbeck http://www.sysmocom.de/ ======================================================================= * sysmocom - systems for mobile communications GmbH * Alt-Moabit 93 * 10559 Berlin, Germany * Sitz / Registered office: Berlin, HRB 134158 B * Geschaeftsfuehrer / Managing Directors: Holger Freyther, Harald Welte