From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qw0-f43.google.com (mail-qw0-f43.google.com [209.85.216.43]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id 5CAA4201A73 for ; Tue, 31 May 2011 07:42:13 -0700 (PDT) Received: by qwf6 with SMTP id 6so3202282qwf.16 for ; Tue, 31 May 2011 07:58:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:sender:message-id:date:from:organization :user-agent:mime-version:to:subject:references:in-reply-to :content-type; bh=SGf+98RSB1NplJNnx6iEUT3UgeAWXmLcrFcMRLpta88=; b=Xyl8Os3dZMYu1E8Vk8OLrh6PPe1zNrEk2HjmN2CiHrnyNeHA+tnu0hK1ABqkrsl9mq ma6HXoawINqhwipgxAT4pg+ms1Bdpy2t4SLRg9XpDqiMeyvfDw52o8d162REhM7Xiywq SPbE8gKCU2PVO/W3bMyFU0TOtZGD5BeQPOk74= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=sender:message-id:date:from:organization:user-agent:mime-version:to :subject:references:in-reply-to:content-type; b=xFpKaQBL+W3S9pI+wc+QFW4Uz5WaVJB39ukrwJEEKc0mYKJa04GL5r4SS9gIqvgNeb jNUjJxtBsZfZ/lEhUhJj+5Qz1FvCbpVeV0txNMHnA5aaC+kKLhn3x1Iw+j42jOXwDL6a nWaycaYe+KCRc81AY1GS1gER9kqOHP20czMqI= Received: by 10.224.104.80 with SMTP id n16mr4449787qao.361.1306853936869; Tue, 31 May 2011 07:58:56 -0700 (PDT) Received: from [192.168.43.191] (c-24-218-177-117.hsd1.ma.comcast.net [24.218.177.117]) by mx.google.com with ESMTPS id mz7sm83570qcb.11.2011.05.31.07.58.55 (version=SSLv3 cipher=OTHER); Tue, 31 May 2011 07:58:55 -0700 (PDT) Sender: Jim Gettys Message-ID: <4DE5022E.5050901@freedesktop.org> Date: Tue, 31 May 2011 10:58:54 -0400 From: Jim Gettys Organization: Bell Labs User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.17) Gecko/20110424 Lightning/1.0b2 Thunderbird/3.1.10 MIME-Version: 1.0 To: bloat@lists.bufferbloat.net References: <7ipqn1bkhy.fsf@lanthane.pps.jussieu.fr> In-Reply-To: Content-Type: multipart/alternative; boundary="------------020907080808040400010409" Subject: Re: [Bloat] tiny monsters: multicast packets 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, 31 May 2011 14:42:13 -0000 This is a multi-part message in MIME format. --------------020907080808040400010409 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit On 05/29/2011 11:57 AM, Dave Taht wrote: > > > On Sun, May 29, 2011 at 9:21 AM, Juliusz Chroboczek > > wrote: > > > And the irony is that the lower speed is specifically chosen for > > multicast in order to make sure all clients in range can hear them > > reliably. > > It was my understanding that it was done for compatibility with older > devices, since 2 Mbit/s is the fastest rate supported by pre-B > spread-spectrum hardware. > > > And thus, everybody loses. I doubt there is much 802.11b gear still > active in the field. I think Juliusz is referring to old stuff pre-B, like the Digital RoamAbout. Certainly that is long gone, and I think pretty much all b hardware is gone, though having a "screw your performance to make something antique run" option someplace might become necessary for someone. - Jim --------------020907080808040400010409 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit On 05/29/2011 11:57 AM, Dave Taht wrote:


On Sun, May 29, 2011 at 9:21 AM, Juliusz Chroboczek <jch@pps.jussieu.fr> wrote:
> And the irony is that the lower speed is specifically chosen for
> multicast in order to make sure all clients in range can hear them
> reliably.

It was my understanding that it was done for compatibility with older
devices, since 2 Mbit/s is the fastest rate supported by pre-B
spread-spectrum hardware.


And thus, everybody loses. I doubt there is much 802.11b gear still active in the field.
I think Juliusz is referring to old stuff pre-B, like the Digital RoamAbout.  Certainly that is long gone, and I think pretty much all b hardware is gone, though having a "screw your performance to make something antique run" option someplace might become necessary for someone.
                - Jim

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