[lwip-devel] [task #6735] Provide new pbuf type: PBUF_RAM_NOCOPY

[Jared Grubb]

Follow-up Comment #26, task #6735 (project lwip):

> I think that's wasteful, and this is part of the reason for the existence
of PBUF_REF - only copy it if you need to. Otherwise you may as well simplify
the API and say users must always copy such data into a PBUF_RAM. 

Yes, that's true and would be wasteful.

> I think in some cases (especially for UDP) you can expect some packets to
be sent directly and they never need to be copied. 

That's not true if the driver is non-blocking; control may have returned to
the application before the packet is even sent.

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