From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from nm20.access.bullet.mail.sp2.yahoo.com (nm20.access.bullet.mail.sp2.yahoo.com [98.139.44.147]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by huchra.bufferbloat.net (Postfix) with ESMTPS id BC15521F107 for ; Thu, 15 Nov 2012 13:19:17 -0800 (PST) Received: from [98.139.44.105] by nm20.access.bullet.mail.sp2.yahoo.com with NNFMP; 15 Nov 2012 21:19:15 -0000 Received: from [67.195.22.107] by tm10.access.bullet.mail.sp2.yahoo.com with NNFMP; 15 Nov 2012 21:19:15 -0000 Received: from [127.0.0.1] by smtp103.rog.mail.gq1.yahoo.com with NNFMP; 15 Nov 2012 21:19:15 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rogers.com; s=s1024; t=1353014355; bh=pV5TKu2SDOVCmtwTxxQ2J09Vt5srAvT8c31nJOhiMcQ=; h=X-Yahoo-Newman-Id:X-Yahoo-Newman-Property:X-YMail-OSG:X-Yahoo-SMTP:Received:Message-ID:Date:From:Reply-To:User-Agent:MIME-Version:To:Subject:References:In-Reply-To:X-Enigmail-Version:Content-Type:Content-Transfer-Encoding; b=3j3hJXvBp8ruxdgQfC3358eyvnyJ75laEyDFDjtLq1pFjUVorWyn3HCVl/yvoSXI1M/FTMk08Wif1wzhePQgTO8+0TWDJldg7AVcwuuq0dFeIQrerZlElPzKu5gtr189KYZiZzxD2zxnFiY8Zv1QLPwrjwlcKBmrlsA8lBEdBGE= X-Yahoo-Newman-Id: 298365.68581.bm@smtp103.rog.mail.gq1.yahoo.com X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: eGu0FtUVM1kZqGeebD.ugWBZrzUUsXyU3nV7h9U55FzPF6s t_TFC_3vQHpUXId0PKNqZQ1S_D858XUTa9T.HhVIE83iyvb6pIMmyxvt6xeB EB1e0lclTAH94.HyVsDGfrimjZyRZQSX8hycnfLvG2RklTZvBcti2DLU9LJQ HTkMSh4mdWMuwoPLTDZtu0UmFRkFLfqQPwIg8PmyEU0vBIttgTdm3v1xgxtr 0XamVt6OVs30.i36y__N5qj4OZ4aSKN5bgZmefXbjRWD2rH3lOEko7PH_bIT gszE1VzWx.RuvYGuhHqz7E0PTruwHVDLLNWQE7huIMRZm4eiYtPXjb9xQmU2 WPyAfQaSHU_JjDJnaS6jP2DGrhYVOtCJE4M0MWe6Bkex2_NHCpu_6JS3bsNu 0d7Hec_WKBoG08NWciagAiQLZnHBsK.smBTt9OypX_O9QFWnDL8nNaMfPTxh anntHjUR0UhH.Eu7ufEOcIn.T6CyN7iQ_gMBCLONArJiszKs2O6PEDK0v7j4 BF.Q_yjfQPrGBx7bugLox21PCWjdBFQ45T1E0R.zLOwbOXis. X-Yahoo-SMTP: sltvjZWswBCRD.ElTuB1l9j6s9wRYPpuyTNWOE5oEg-- Received: from [192.168.11.50] (davec-b@216.13.131.9 with plain) by smtp103.rog.mail.gq1.yahoo.com with SMTP; 15 Nov 2012 13:19:15 -0800 PST Message-ID: <50A55D03.4030707@rogers.com> Date: Thu, 15 Nov 2012 16:22:11 -0500 From: David Collier-Brown User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120430 Thunderbird/12.0.1 MIME-Version: 1.0 To: bloat@lists.bufferbloat.net References: In-Reply-To: X-Enigmail-Version: 1.4.2 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 8bit Subject: [Bloat] Slightly denatured articles about NC State proposal to uncongest wireless X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list Reply-To: davecb@spamcop.net List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Nov 2012 21:19:17 -0000 I imagine everyone in the world has see either the secondary-source, http://news.ncsu.edu/releases/wms-gupta-wifi/ ... or the tertiary source discussion linked to at slashdot. >From the description below, this seems to be orthogonal to bufferbloat, and almost completely aimed at prioritizing the access point over its clients... Eventually we'll know more: "The paper, “WiFox: Scaling WiFi Performance for Large Audience Environments,” will be presented at the ACM CoNEXT 2012 conference being held in Nice, France, Dec. 10-13. Abstract: WiFi hotspots in locations such as airports and large conventions frequently experience poor performance in terms of downlink goodput and responsiveness. We study the various factors responsible for this performance degradation. We analyse and emulate a large conference network environment on our testbed with 45 nodes. We find that presence of asymmetry between the uplink/downlink traffic results in backlogged packets at WiFi Access Point’s (AP’s) transmission queue and subsequent packet losses. This traffic asymmetry results in maximum performance loss for such an environment along with degradation due to rate diversity, fairness and TCP behavior. We propose our solution WiFox, which (1) adaptively prioritizes AP’s channel access over competing STAs avoiding traffic asymmetry (2) provides a fairness framework alleviating the problem of performance loss due to rate-diversity/fairness and (3) avoids degradation due to TCP behavior. We demonstrate that WiFox not only improves downlink goodput by 400-700 % but also reduces request’s average response time by 30-40 %." --dave -- David Collier-Brown, | Always do right. This will gratify System Programmer and Author | some people and astonish the rest davecb@spamcop.net | -- Mark Twain (416) 223-8968