Re: per neighbor packet buffering "issue"

[Rob Austein <sra at isc.org>]

At Tue, 21 Oct 2008 16:08:09 +0200, Julien Abeillé wrote:
> 
> uIPv6 holds on 11K of flash, and a minimum of 1.8K of RAM (3K with IP
> fragmentation support)
>  
> - The most costly feature is "per neighbor packet buffering", mandated
> by RFC4861. On constrained platforms, there is no dynamic memory
> allocation, hence if the neighbor cache can hold  four entries (a
> minimum in a sensor network), we must define four 1280 bytes buffer,
> which is huge in comparison to the initial 1.8K.
>  
> My question is: do you think it makes sense to change the MUST into a
> SHOULD?

I would support SHOULD.  Packet buffers are a precious resource when
you get far enough into the embedded world.  Protocol specifications
have to allow for the possiblity that both packet buffers might
already be in use. :)
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