[B.A.T.M.A.N.] Fwd: Re: increasing BATADV_FRAG_MAX_FRAGMENTS

[Christof Schulze <christof.schulze@gmx.net>]

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Dirk is not on this list, so I am forwarding the information of ihs
experiment.

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Hi, Marek!

Please forward this as appropriate.

Am 30.06.2014 um 08:08 schrieb Marek Lindner <mareklindner@neomailbox.ch>:
> > During an experiment it was found, that
> > BATADV_FRAG_MAX_FRAGMENTS=16 allows ~72 clients to be connected to
> > one single access point.
> would you mind sharing some details regarding the experiments you
> performed ?  The reason for this question is that there is no 72
> client limit we know of (unless fragmentation was disabled).

I put a freifunk router with batman.adv in a room with 300 conference 
participants (with about 2 WLAN clients p.p.) as an emergency network access 
means for a failing venue network.

The batman client statistic showed a very untypical hard clip at 72/74 batman 
clients and new wlan clients seem to time-out without any network traffic like 
this:

Thu Jun 26 15:33:44 2014 kern.warn kernel: [15577.090000] net_ratelimit: 1121 
callbacks suppressed
At the same time, I'm seeing a lot of these:
Thu Jun 26 15:31:54 2014 daemon.info hostapd: wlan0-1: STA b4:f0:ab:9b:b0:94 
IEEE 802.11: associated (aid 7)
Thu Jun 26 15:32:54 2014 daemon.info hostapd: wlan0-1: STA b4:f0:ab:9b:b0:94 
IEEE 802.11: disassociated
Thu Jun 26 15:32:55 2014 daemon.info hostapd: wlan0-1: STA b4:f0:ab:9b:b0:94 
IEEE 802.11: deauthenticated due to inactivity (timer DEAUTH/REMOVE)
 



There is no hostapd client limit configured and otherwise (as I understand it), 
clients would be have been rejected and not time-out without access to the 
DHCP-Server (only accessible via batman).

Unfortunately, that setup is no longer available for more testing.

Any ideas?

Dirk

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