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Date: Wed, 25 Jan 2017 04:02:22 +0100
From: Andrew Lunn <andrew@lunn.ch>
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Subject: Re: [B.A.T.M.A.N.] limit of if per batman
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On Wed, Jan 25, 2017 at 03:21:58AM +0100, jens wrote:
> On 24.01.2017 14:39, Sven Eckelmann wrote:
> > There is no artificial limit added by batman-adv. But transmitting a lot of
> > broadcasts over 255 virtual links sharing the same physical link
> > might get interesting (independent of batman-adv).
> 
> this made me curious , and i modified your script a bit - turns out
> after the 127. IF you add to batman-adv you get an Error -
> all 510 gretap links was succesfully build ...
> # ifconfig |grep gre| wc -l
> 515
> # batctl if|sort|wc -l
> 127
> the error is mainly
> *Error - can't write to file
> '/sys/class/net/gre128/batman_adv/mesh_iface': Cannot allocate memory

Hi Jens

What sort of machine are you running this on? How much RAM does it
have?

My guess is, you are running it on a little box with not much RAM.  If
you tried again on your desktop with a few Giga byte of RAM, you will
get a different limit.

    Andrew