[lwip-devel] [patch #9384] Partial SACK (RFC 2018) support

[Simon Goldschmidt]

Follow-up Comment #6, patch #9384 (project lwip):

> About the alignment and MACs...

For this, it's worth to know that Mac/DMa-Alignment != MEM_ALIGNMENT! We don't
have that implemented yet, but it's on the roadmap. Some systems have a larger
alignment requirement and for them, we would need to know the exact space
required for all headers when allocating.

On the other hand, many MACs (or drivers) don't support scatter-gather, so
having a frame in one pieces requires memcpy.

In any case, ideas like moving the TCP header don't really work, since we must
obey the MSS. So we could as well transmit 32 bytes of NOPs (at max.) instead
to have room for SACK regions...?

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