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Subject: RE: [B.A.T.M.A.N.] Multiple radios to improve throughput
Date: Tue, 3 Jun 2008 10:24:12 +0200
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From: Predrag Balorda <predrag.balorda@gmail.com>
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	The list for a Better Approach To Mobile Ad-hoc Networking
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To: 'The list for a Better Approach To Mobile Ad-hoc Networking' <b.a.t.m.a.n@open-mesh.net>

Now, is this CPU bottleneck because of batman and routing or something else?
(cannot forward packets fast enough?)
11mbits isn't really that much and I still have to see my setup hit that figure
between only two nodes, let alone multi-hop.

Now that we've played around a bit can someone please provide some benchmarks of
a 5-node network (with some multi-hop paths) with batman and with just the whole
network bridged and on the same subnet.

What sort of performance should you expect in either scenario?

As I said before, I used to get 1MB/s with non-routed bridged network of two
atheros devices but ever since I started using batman, 300KB/s is the most I was
ever able to achieve between the same two nodes. 2 hops and it goes down to
40KB/s.

> -----Original Message-----
> From: b.a.t.m.a.n-bounces@open-mesh.net [mailto:b.a.t.m.a.n-bounces@open-
> mesh.net] On Behalf Of Shane Chao
> Sent: Tuesday, June 03, 2008 1:34 AM
> To: b.a.t.m.a.n@open-mesh.net
> Subject: [B.A.T.M.A.N.] Multiple radios to improve throughput
> 
> Elektra,
> 
> Thank you for pointing out in May 08 that most embedded boards do not
> have enough CPU power to saturate the capacity of single radio link.  I
> was experimenting Batman in a straight line, three node configuration
> with the middle node having two radios so it doesn't have to switch
> between node 1 and node 3.  My configuration is as follows:
> 
> node 1          node 2          node 3
> ------          ------          ------
>   ath0 <--ch 1--> ath0
>                   ath1 <--ch 11-> ath0
> 
> When I ran iperf between node 1 and 3, I did not see any throughput
> improvements with either one or two radios in node 2. I even stopped
> Batman and manually setup the routes and the performance remains the
> same.  However, when I upgrade node 2 from a 200MHz CPU board to a
> 500MHz CPU board, the bandwidth went up 50%.  So thanks again for
> pointing out my bottleneck:)
> 
> Lastly, can someone suggest some embedded boards fast enough to push
> wifi radios to its limits?
> 
> Thanks,
> Shane
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