[Olsr-users] about LQ, ETX and throughput

[Henning Rogge]

LQ/NLQ (and ETX) of olsrd(v1) is just calculated by using the
multicast frame loss, which means it is the loss on the base-datarate
of your wifi. They don't care about the unicast speed.

That's why we moved to an airtime metric in olsrd2, which combines
frame loss with link speed.

Henning

On Sat, Feb 7, 2015 at 3:31 PM, Armansah Hs <(spam-protected)> wrote:
> hello,
> I've run several scenarios of OLSR.
> I send a file from one laptop to the other laptop through several nodes and
> I get a significant difference in throughput
>
> scenario 1
>
> -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -
> -  -  -  -  -  -  -  -  -  -  -  node F
>
>
>
>
> -  -  -  -  -  -  -  -  -  -  node D-  -  -  -  -  -  -  -  -  -  node E
>
>
>
>
>
> -  -  -  -  -  -  -  -  -  -  node B-  -  -  -  -  -  -  -  -  -  node C
>
>
>
>
> node A
>
>
> link quality 1.00
> A - B
>
> B - C
> B - D
> B - E
> C - D
> C - E
> D - E
>
> F - E
>
> so the packet will send from A - B - E - F
> throughtput around 0.450 Mbit/s
> I've run this scenario 5 times and get similar throughput
>
> strangely, when node F mobile to get closer to node D
> LQ F - D will be 1.00 and F - E rise to >2.00
> the route will from A - B - D - F
> this route verified by traceroute
> throughput in this scenario ~1.3 Mbit/s (running about 5 times)
>
> why this happen?
> distance?
>
> LQ 1.00
> distance 20m
> A ------------ B
>
> LQ 1.00
> distance 10m
> A ----- B
> get better throughput ?
>
>
> Thanks
> Arman
>
>
>
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