Hi Jack, what is the throughput you get from B to C? What was the throughput you got on the 2.4GHz link alone? Did you change to 2.4GHz on A-B or B-C?
Cheers, Linus On Mon, Oct 14, 2013 at 09:26:41AM +0800, Zaki wrote: > 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 > <[email protected]> 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] > >> > >> 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.
