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From: Sven Eckelmann <sven@narfation.org>
Date: Sat, 03 Feb 2018 08:41:24 +0100
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Subject: Re: [B.A.T.M.A.N.] limit of if per batman
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To: jens@viisauksena.de
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On Dienstag, 23. Januar 2018 13:33:01 CET Sven Eckelmann wrote:
> On Dienstag, 26. Dezember 2017 15:19:41 CET Sven Eckelmann wrote:
> > On Mittwoch, 25. Januar 2017 08:15:52 CET Sven Eckelmann wrote:
> > [...]
> > > > 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
> > > [...]
> > [...]
> > > I would guess that your system mostly fails becauseit  cannot handle the
> > > allocation of the "large" arrays which store:
> > [...]
> > 
> > Looks like their could also be a different problem when your test system uses 
> > signed characters by default. Please try the patch [1] which changes the type 
> > from char/s16 to unsigned int.
> [...]
> > [1] https://patchwork.open-mesh.org/patch/17247/
> 
> Were you able to run some tests?

Would be good to have this tested because we already missed the Linux 4.15 
release.

Kind regards,
	Sven


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