[B.A.T.M.A.N.] Network coding multi-hop bandwidth loss

[cmsv <cmsv@wirelesspt.net>]

I just found out /(the hard way) that using network coding (batman-adv
2013.4) that i have a massive, unbelievable bandwidth loss if i have
more than one hop to the destination

I tested this in a real scenario with 11 nodes as well as 3 nodes in a
house with 3 floors and having one per each floor.

Here is the example with 3 nodes

A <------ B -----> C

From node B to iperf reports me 15 mbit
From node B to node C iperf reports me 9 mbit

Then, from node C to node A i get values bellow 1 mbit such as 647kbits
or less.
More than 3 nodes is to forget.

uci set batman-adv.bat0.network_coding=0 disables nc and solved the
problem which brought the network bandwidth to a more realistic and
mathematical acceptable bandwidth level.

Is this finding known by others ?



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