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?. 2) If my Iperf TCP throughput from A to B is 40Mbps, what is the expected throughput of Iperf from A to C ?.
Thanks a lot.
Jack.
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.
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.
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 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.
Hi Linus,
From A to B(radio 1) it is 5.24GHz. Throughput is 40Mbps.
From B(radio 2) to C it is 2.412GHz.
Throughput is 38Mbps.
From A to C the throughput is just 20Mbps.
Thanks. Jack.
On Mon, Oct 14, 2013 at 11:37 PM, Linus Lüssing linus.luessing@web.de wrote:
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 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.
Hi Jack,
One more test could be interesting: What throughput do you get with static routes over the wifi interfaces directly, without batman-adv?
Just to check whether it's batman-adv's fault or something else (e.g. cheap, unshielded wifi chips, a bug in the test setup / configuration).
Cheers, Linus
On Thu, Oct 17, 2013 at 11:21:57AM +0800, Zaki wrote:
Hi Linus,
From A to B(radio 1) it is 5.24GHz. Throughput is 40Mbps.
From B(radio 2) to C it is 2.412GHz. Throughput is 38Mbps.
From A to C the throughput is just 20Mbps.
Thanks. Jack.
On Mon, Oct 14, 2013 at 11:37 PM, Linus Lüssing linus.luessing@web.de wrote:
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 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.
Hi Linus,
Good idea. I will try that right away.
Thanks. Jack.
On Thu, Oct 17, 2013 at 12:28 PM, Linus Lüssing linus.luessing@web.de wrote:
Hi Jack,
One more test could be interesting: What throughput do you get with static routes over the wifi interfaces directly, without batman-adv?
Just to check whether it's batman-adv's fault or something else (e.g. cheap, unshielded wifi chips, a bug in the test setup / configuration).
Cheers, Linus
On Thu, Oct 17, 2013 at 11:21:57AM +0800, Zaki wrote:
Hi Linus,
From A to B(radio 1) it is 5.24GHz. Throughput is 40Mbps.
From B(radio 2) to C it is 2.412GHz. Throughput is 38Mbps.
From A to C the throughput is just 20Mbps.
Thanks. Jack.
On Mon, Oct 14, 2013 at 11:37 PM, Linus Lüssing linus.luessing@web.de wrote:
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 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.
Hi Linus, Simon,
Testing with static routes yields the same result. After thorough testing, i found strange throughput pattern on one of my radio. It's my hardware problem after all. Phew... Thanks a lot for your input. I appreciate it.
Rgds, Jack.
On Thu, Oct 17, 2013 at 12:28 PM, Linus Lüssing linus.luessing@web.de wrote:
Hi Jack,
One more test could be interesting: What throughput do you get with static routes over the wifi interfaces directly, without batman-adv?
Just to check whether it's batman-adv's fault or something else (e.g. cheap, unshielded wifi chips, a bug in the test setup / configuration).
Cheers, Linus
On Thu, Oct 17, 2013 at 11:21:57AM +0800, Zaki wrote:
Hi Linus,
From A to B(radio 1) it is 5.24GHz. Throughput is 40Mbps.
From B(radio 2) to C it is 2.412GHz. Throughput is 38Mbps.
From A to C the throughput is just 20Mbps.
Thanks. Jack.
On Mon, Oct 14, 2013 at 11:37 PM, Linus Lüssing linus.luessing@web.de wrote:
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 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.
b.a.t.m.a.n@lists.open-mesh.org
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Linus Lüssing -
Simon Wunderlich -
Zaki