From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from tuna.sandelman.ca (unknown [IPv6:2607:f0b0:f:3:216:3eff:fe7c:d1f3]) by huchra.bufferbloat.net (Postfix) with ESMTP id 0571321F0B3 for ; Tue, 1 Jan 2013 09:50:14 -0800 (PST) Received: from sandelman.ca (unknown [IPv6:2607:f0b0:f:2::247]) by tuna.sandelman.ca (Postfix) with ESMTP id B3DBF20168 for ; Tue, 1 Jan 2013 12:54:00 -0500 (EST) Received: by sandelman.ca (Postfix, from userid 179) id 334D3636C7; Tue, 1 Jan 2013 12:49:26 -0500 (EST) Received: from sandelman.ca (localhost [127.0.0.1]) by sandelman.ca (Postfix) with ESMTP id 2539E636C4 for ; Tue, 1 Jan 2013 12:49:26 -0500 (EST) From: Michael Richardson To: bloat@bufferbloat.net X-Mailer: MH-E 8.3; nmh 1.3-dev; XEmacs 21.4 (patch 22) X-Face: $\n1pF)h^`}$H>Hk{L"x@)JS7<%Az}5RyS@k9X%29-lHB$Ti.V>2bi.~ehC0; <'$9xN5Ub# z!G,p`nR&p7Fz@^UXIn156S8.~^@MJ*mMsD7=QFeq%AL4m Sender: mcr@sandelman.ca Subject: [Bloat] wifi AP switching time 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: Tue, 01 Jan 2013 17:50:14 -0000 A comment was made a month ago or so about how long it takes wifi APs to switch from transmitting (unicast) to one station to another. That there was quite a large latency here, and that this was one reason that the AP designers wanted large buffers to accmulate, so that the switching time could be amortized over a larger number of packets. I'm looking for a definitive reference to this problem. Will this be in the 802.11 specification, or is this an inherent problem in the chipsets, not the physics? -- ] He who is tired of Weird Al is tired of life! | firewalls [ ] Michael Richardson, Sandelman Software Works, Ottawa, ON |net architect[ ] mcr@sandelman.ottawa.on.ca http://www.sandelman.ottawa.on.ca/ |device driver[ Kyoto Plus: watch the video then sign the petition.