Re: [B.A.T.M.A.N.] batman-adv bonding feature - unable to get data packets fragmented into multiple wireless interfaces

Hello Syed,

thanks for testing.

Please don't send HTML mails to the mailing list, they will get rejected.

Thank you Simon

On Monday 13 October 2014 08:26:59 syedmoulana47 wrote:

I am using batman-adv: 2012.5.0. I tried with version 2014.3.0 also.

Even without enabling bonding sometimes I can see simultaneous outbound udp traffic in both interfaces wlan0 and wlan1.

I will try with the patch and update.

Thanks.

Sent from my Xiaomi

On 11 Oct 2014 03:03, Simon Wunderlich sw@simonwunderlich.de wrote: Hey Syed,

which version of batman-adv are you using?

Please note there is a fix for a bonding problem which hasn't been merged yet,

please merge it manually for your tests (assuming you are using a

recent version)

https://lists.open-mesh.org/pipermail/b.a.t.m.a.n/2014-August/012382.html

Also bonding has nothing to do with fragmentation - the idea of bonding is that the packets should not be split, but get sent interleaved over the interfaces, e.g.

• wlan 1 - packet 1
• wlan 2 - packet 2
• wlan 1 - packet 3
• wlan 2 - packet 4
• etc ...

To have a real gain from that, the two links must be equally good quality. Also deep queues in the driver may cause reordering of packets which will upset TCP. The best results I've seen in the past were 50% performance gain over a single link, but I didn't try it out in real world scenarios lately.

Thanks, Simon On Tuesday 07 October 2014 17:27:50 syed moulana wrote:

...

hi

I tested the throughput between point to point mesh nodes using single and 2 radios.

1. Using single radio (ch 5180) the resulting throughput for HT40+

      TCP max 250mbit/s
      UDP - max 320mbit/s
   
   
   

2. Using 2 radios with and without batctl bonding enabled (ch 5180 for

wlan0, ch 5785 for wlan1), the resulting throughput for HT40+ is same.

       with batctl bonding and fragmentation enabled I believed I

should be getting 50% gain in througput.

When I monitor the wlan0 and wlan1 interfaces using batctl tcpdump

-p 4 wlanx I can see that iperf data are interleaved.

There is no splitting of data frames into 2 wireless interfaces.

Please advice

Tq

Syed