Re: [B.A.T.M.A.N.] Memory leak

[Axel Neumann <axel@open-mesh.net>]

Hi,

On Samstag 05 Januar 2008, Freifunk Dresden wrote:
> Hi,
>
> I have checked the problem a little more. Beside the "top" command on
> debian can show the same as the "top" does on WRTs. If you press 'H' the
> threads are also shown. Perhaps the implementation of the "top" or "ps"
> show the threads too.
>
> There are four batmand threads running. After a while one thread is
> terminated for about 100 seconds (25 x 4 seconds) and a new thread is
> created after
> this time. At this time the memory needs is increased. It seams that
> at each thread-kill-restart 16 Kbytes are wasted. The virtual assinged
> memory increases
> and also the %-Value used.

Does it really increase endlessly with each new thread ? 
If its the GW-client thread then you can enforce the termination and 
recreation on-the-fly with batmand -c -r0 (to destroy the tunnel) and 
-c -r3 (to create the tunnel)

>
> Below you will see the values (memory and pid) delivered by "top" for one
> incrementation.
> Hope it gives you a hint.
> Why is the thread killed and created? There is no client conntected to any
> router. rdate is restarted periodically and the laptop is telling that it
> has an internet connection (configured through batmand arguments, which is
> wanted).
> Note that the laptop does not have a connection to internet. It just
> pretends it has one.

there is a blackhole detection in the default two-way-tunnel. This can cause 
the client to disconnect from the unresponsive (-blackhole-) GW and put the 
GW on a blacklist for some time. It should all be reported on debug-level 3.
If no other GW is available, the GW-client node will reconnect to the GW after 
a while (might be 100 sec).
If you have a dummy GW, either use --no-unresp-gw-check or 
use --one-way-tunnel 3 at the client and the GW side 


/axel

>
>
> MEM: 1180   8%
> PIDS:1 -> 893 -> 894 -> 895
>                       -> 2673
>
> Pid 2673 terminates
> MEM: 1180   8%
> ....
> 100 seconds
> ....
> MEM: 1180   8%
> Pid 3751 is created
> MEM: 1196   9%
> 1 -> 893 -> 894 -> 895
>                  -> 3751
> MEM: 1196   9%
>
>
> Bye
>   Stephan
>
>
>
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