From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-vb0-x22d.google.com (mail-vb0-x22d.google.com [IPv6:2607:f8b0:400c:c02::22d]) (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 0B8DF21F1CF for ; Mon, 13 May 2013 17:57:28 -0700 (PDT) Received: by mail-vb0-f45.google.com with SMTP id 12so5708625vbf.18 for ; Mon, 13 May 2013 17:57:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=kWjxNWex6sGsqA8lEwESLtz4de5ye++xfOfv4xYutkE=; b=R88V/MF1FGoxli08Kb1J+XV2QTP5fj/D42L6y/bVEktsvCyTUt+I1tkJx4GW4HAA6g yiiJB2PrxcDFpusfFAiu9UR12jMIo86cE5gvUpksiXf4DYjB6PO+S8r4rjvGMEMBjyH1 Dk+7R+EfdYof2tb6smP/jW4fIWCqhIWzI5udkDQfQgYHtykFkoRyVMun+Fjr5gtz5Gf0 KW8lqplmP1tU29LtMTYe8GdieXDm0OonAwnAEz3lIb5u0yPdiiGCzkkDwtzutlkOKxWV FRLWp3bL1yseYXg2Uz50J4XyS3T4hfkAzcYA0WGY7l34Gs6ndjyyuQpbecMuhz8xHLqg +0sQ== MIME-Version: 1.0 X-Received: by 10.58.34.166 with SMTP id a6mr20385579vej.17.1368493048078; Mon, 13 May 2013 17:57:28 -0700 (PDT) Received: by 10.58.7.10 with HTTP; Mon, 13 May 2013 17:57:28 -0700 (PDT) In-Reply-To: References: Date: Mon, 13 May 2013 17:57:28 -0700 Message-ID: From: Dave Taht To: Richard Smith Content-Type: multipart/alternative; boundary=089e0122ac5c02293704dca31e9a Cc: cerowrt-devel@lists.bufferbloat.net Subject: Re: [Cerowrt-devel] fiddling with wireless, batman-adv, etc X-BeenThere: cerowrt-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: Development issues regarding the cerowrt test router project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 14 May 2013 00:57:29 -0000 --089e0122ac5c02293704dca31e9a Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On Mon, May 13, 2013 at 5:47 PM, Richard Smith wrote: > > I believe these results (which was from about that many machines and > there > > were some good data being presented and crunched) were using multiple > > channels and diversity routing, which in the b.a.t.m.a.n world > > is called "interface alternating" > > > > http://www.open-mesh.org/projects/batman-adv/wiki/Multi-link-optimize > > Ok. I'll have to ask about it on the batman-adv list. > > > As I recall OLPC now has two radios? > > Yes. We added a Marvell 8787 option to the XO-4. The 8787 can do > either 2.4Ghz or 5Ghz just not simultaneous. Sorry man, I tend to view the dense mesh problem as unsolvable without diversity routing and 2 or more channels available. There's some upcoming work on power management that is seeking funding I can send you a brief on, which will probably help the single channel case, but.... > In theory you could use > the 8787 card with an XO-1.75 but the mwifiex driver would need to be > backported on to the 1.75 kernel or OLPC 1.75 specific patches ported > to a newer kernel with mwifiex support. Both involve a good bit of > effort. > > -- > Richard A. Smith > One Laptop per Child > --=20 Dave T=E4ht Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/subscribe.html --089e0122ac5c02293704dca31e9a Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable

On Mon, May 13, 2013 at 5:47 PM, Richard= Smith <richard@laptop.org> wrote:
> I believe these results (which was from about that m= any machines and there
> were some good data being presented and crunched) were using multiple<= br> > channels and diversity routing, which in the b.a.t.m.a.n world
> is called "interface alternating"
>
> http://www.open-mesh.org/projects/batman-adv/= wiki/Multi-link-optimize

Ok. =A0I'll have to ask about it on the batman-adv list.

> As I recall OLPC now has two radios?

Yes. =A0We added a Marvell 8787 option to the XO-4. =A0The 8787 can d= o
either 2.4Ghz or 5Ghz just not simultaneous.

Sorry ma= n, I tend to view the dense mesh problem as unsolvable without diversity ro= uting and 2 or more channels available.

There's some upcoming wo= rk on power management that is seeking funding I can send you a brief on, w= hich will probably help the single channel case, but....
=A0In theory you could use
the 8787 card with an XO-1.75 but the mwifiex driver would need to be
backported on to the 1.75 kernel or OLPC 1.75 specific patches ported
to a newer kernel with mwifiex support. =A0Both involve a good bit of
effort.

--
Richard A. Smith
One Laptop per Child



--
Dave T=E4ht=

Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/= subscribe.html=20 --089e0122ac5c02293704dca31e9a--