On Mon, May 13, 2013 at 5:47 PM, Richard Smith <richard@laptop.org> 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