I too would like to see this benchmark setup. I have a private mesh that I've been using batman and olsr on that consists of about 8 nodes that end up spread out of about a 2000m x 2000m area and right now I'm only using one radio for the mesh. I'm pushing video from about 4 of these nodes and if I try to do more than 2 hops with the video I see drastic drops in the video performance.
I use Avila Gateworks boards that have 533 MHz Intel Xscale processors and I've never seen the cpu even close to taxed by batman, olsr, or the radios, as a point of reference for the original poster. They also have a newer board with a 633 Mhz cpu.
On Tue, 2008-06-03 at 10:24 +0200, Predrag Balorda wrote:
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 _______________________________________________ B.A.T.M.A.N mailing list B.A.T.M.A.N@open-mesh.net https://list.open-mesh.net/mm/listinfo/b.a.t.m.a.n
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