From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cassarossa.samfundet.no (cassarossa.samfundet.no [IPv6:2001:67c:29f4::29]) (using TLSv1 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (Client did not present a certificate) by huchra.bufferbloat.net (Postfix) with ESMTPS id 925E121F300 for ; Thu, 21 Aug 2014 01:58:07 -0700 (PDT) Received: from pannekake.samfundet.no ([2001:67c:29f4::50] ident=unknown) by cassarossa.samfundet.no with esmtps (TLS1.2:DHE_RSA_AES_128_CBC_SHA1:128) (Exim 4.80) (envelope-from ) id 1XKOC3-0006E3-QK for bloat@lists.bufferbloat.net; Thu, 21 Aug 2014 10:58:04 +0200 Received: from sesse by pannekake.samfundet.no with local (Exim 4.80) (envelope-from ) id 1XKOC3-0005j7-Hh for bloat@lists.bufferbloat.net; Thu, 21 Aug 2014 10:58:03 +0200 Date: Thu, 21 Aug 2014 10:58:03 +0200 From: "Steinar H. Gunderson" To: bloat@lists.bufferbloat.net Message-ID: <20140821085803.GA21250@sesse.net> References: <91696A3A-EF44-4A1A-8070-D3AF25D0D9AC@netapp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Operating-System: Linux 3.16.0-rc5 on a x86_64 User-Agent: Mutt/1.5.21 (2010-09-15) Subject: Re: [Bloat] sigcomm wifi X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 Aug 2014 08:58:07 -0000 On Wed, Aug 20, 2014 at 06:05:57PM -0400, Jim Gettys wrote: > The reason why 802.11 works ok at IETF and NANOG is that: > o) they use Cisco enterprise AP's, which are not badly over buffered. I > don't have data on which enterprise AP's are overbuffered. Note that there's a lot more to this kind of solution than “not badly overbuffered”. In particular, you have automated systems for channel assignment, for biasing people onto 5 GHz (which has 10x the number of nonoverlapping channels) and for forcing people to be load-balanced between the different APs. All of this helps in high-density. A lot of what's problematic in crowded areas is actually control traffic, not data traffic, especially since it is sent on the lowest basic rate. (So, well, one thing you do is to set 11Mbit or whatever as the lowest basic rate instead of 1Mbit...) /* Steinar */ -- Homepage: http://www.sesse.net/