[Battlemesh] Batman-adv high TQ and Low throughput

cmsv cmsv at wirelesspt.net
Thu Apr 24 10:34:44 CEST 2014


Recently i have experienced something quite usual to my experience and
that was not happening previously in the same scenario where it is
happening now.

Here is the example:
2 nodes at with adhoc at 2.4ghz at a distance of 415 meters
one uses an omni 15 dbi antenna at 18dbi and another 24 dbi grid at 16 dbi.

This link was previously providing up to 21 mbit being 17 mbit a the
lowest. Batman-adv TQ value was always around 230 being many times above
250.

However this has recently changed the same link with 230~250 TQ and the
same txpower is now outputting 1.93 Mbits/sec

I have used iperf for bandwidth tests. Batman-adv version is 2013.4.
Although i have considered several types of scenarios that can be
causing this issue i have also tested against some which leaves me
puzzled in regards to the presented TQ quality and dBm values as the
nodes dBm are sometimes bad (ie: -80 ~ -90)

One of the main questions is: shouldn't batman-adv TQ reflect or be
influenced by dBm values ? How come with -90 dBm i get batman-adv to
show me 230 TQ ?

Also any feedback based on your experience regarding this type of
scenario is welcome. This situation happened overnight without any
access point new configurations or physical setup changes.






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