Re: Number of IFB devices on a monolithic kernel

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On Thu, 06 Nov 2008 16:40:51 +0100
Peter Rabbitson <rabbit+list@xxxxxxxxx> wrote:

> adi wrote:
> > On Thu, Nov 06, 2008 at 02:46:31PM +0100, Peter Rabbitson wrote:
> >> The IFB device by default initializes only 2 IFB devices (ifb0 and
> >> ifb1). I was able to find (only in the source, no docs) that the code
> >> takes an optional numifbs argument, which overrides the default (line
> >> 221 at [1]). However it seems that there is no way to pass this variable
> >> if the module is compiled into the kernel. Is there some special syntax
> >> to do it, or a simple patch that would enable specification of this
> >> value?
> >>
> >> Worst case scenario I can always change the number at line 59 before
> >> compiling, but I was hoping there is a cleaner way.
> > 
> > Please try:
> > 
> > # ip link add name ifb2 type ifb
> > 
> > Regards,
> > 
> > P.Y. Adi Prasaja
> 
> I had no idea iproute's add worked on links too. Thank you so much!
> 

You can give parameters to builtin modules by putting the parameter
on the kernel boot command line read Documentation/kernel-parameter.txt


in GRUB:
kernel /boot/vmlinuz root=... ro ifb.numifbs=20 ...
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