Hi Zaki/Jack, On Fri, Oct 11, 2013 at 11:11:04AM +0800, Zaki wrote: > Hi, > > I am a newbie in batman-adv. I got a question regarding Hops and > Throughput, especially in regards with a collocated dual-radio device. > Hopefully somebody could offer some help here for me to fully > understand batman-adv operation. I have 3 devices, namely A, B and C. > > A is only having single radio (operating at Freq 5.20G in AdHoc mode). > Put this under bat0. Bridge bat0 with eth0. > B is having dual-radio (radio1 operates at 5.20G in AdHoc mode, radio2 > is at 5.24G in AdHoc mode). Put these under bat0. Bridge bat0 with > eth0 > C is like A (single radio, operating at 5.24G in AdHoc mode). Put this > under bat0. Bridge bat0 with eth0. > > So, the wireless link will be like this : > > [A]::::::::::::::: [B(radio1)---B(radio2)]::::::::::::::::[C] > > 1) If i were to ping from A to C, how many hops is it considered?. Is > it 2 hops or 3 hops?.
that would be two hops. One hop is considered traversing one link, and
you have two links here.
> 2) If my Iperf TCP throughput from A to B is 40Mbps, what is the
> expected throughput of Iperf from A to C ?.
That depends. If the links are not interferring, you should get approx.
the maximum of both link throughputs. So if one link is 30 mbit/s, the second
is 25 mbit/s, that whole path would yield 25 mbit/s - there might be tcp
effects further decreasing throughput (latency etc).
However you use two frequencies adjacent to each other. If you use omni
antennas, expect a lot of interferences (even if the channels are not
overlapping). If you use directional antennas you should be fine.
Cheers,
Simon
>
> Thanks a lot.
>
> Jack.
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