Hi Simon,
Thanks for your reply. I am using omni antenna right now and what i got when i did an iPerf from A to C is only 20Mbps. It looks like the throughput is cut to half (just like a single radio mesh). Tried 2.4G frequency in one of the pair, had the same result too. Anything in terms of setting of batman-adv i can look for?.
Rgds, Jack
On Sun, Oct 13, 2013 at 10:36 PM, Simon Wunderlich simon.wunderlich@s2003.tu-chemnitz.de wrote:
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]
- 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.
- 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.