14 May
2008
14 May
'08
4:31 a.m.
Are both of your radios using 2.4 GHz channels? How close are they and
are you using external antennas?
This paper [1] p13 and this paper [2] p6 both talk about an inter radio
interference issue when using multiple radios on one node.
Dave
[1] http://citeseer.ist.psu.edu/raniwala04centralized.html
[2] http://research.microsoft.com/research/pubs/view.aspx?tr_id=667
Quoting elektra <onelektra(a)gmx.net>et>:
Hi Shane -
if all radios are operating on the same channel you can't expect any
improvement. So operate one link on channel 1 and the other on
channel 11, 13 or 14 according to the regulations in your country.
Channels in the 5 GHz range are even better ;-)
Note also that many embedded devices have not enough CPU power to
saturate the capacity of a single radio link operating at full speed.
At 54 Mbit a single link can have approx. 3 MByte/sec throughput, but
we have experienced that a 200 MHz MIPS CPU doesn't provide enough
power for more than 1.2 to 1.6 MByte/sec with a single interface
depending on the chipset/type of your wifi card.
cu elektra
Hello,
I have a 3 node mesh network with layout as follows:
node #1 node #2 node #3
192.168.2.1 192.168.2.5 192.168.2.9
Each node has only one radio and #1 talks to #3 via #2 and vice versa.
If I want to improve the throughput between #1 and #3, logically I would
add another radio to #2 so it can communicate to both #1 and #3
simultaneously w/o having the single radio switching back and forth
between #1 and #3.
However, I ran IPERF between #1 and #3 before and after adding the
second radio to node #2 and the bandwidth didn't really improve.
In my node #2 configuration, I did not bridge the two wifi interfaces so
I have ath0 and ath1 with their own IP addresses. All three nodes are
configured with the same channel. My batmand command line for node #2
is: batmand ath0 ath1.
Can anyone advise me on what I did wrong?
Thanks,
Shane
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