[lwip-devel] [bug #11400] ARP multi-packet-queue modifies TCP unsent/unacked segment packet pbuf chain into packet queue

[Jonathan Larmour]

Follow-up Comment #12, bug #11400 (project lwip):

My opinion is that I don't think this approach is a good idea. It could mean
a lot of potentially large pbufs having to be allocated from the PBUF_RAM
pool, with very little determinism to their sizes. Determinism is why lwip
has memp's, which intentionally limit resources.

But I'm not advocating allocating these copied pbufs from a distinct memory
pool. Instead it seems much more efficient to create a small structure which
points to each pbuf being queued. Thus you only need to allocate space for
this structure (which can come from a memp pool) and can still leave the
original pbufs untouched. This is the same approach advocated by Leon in the
very first post in this bug.


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