[lwip-devel] [bug #61097] Deadlock due to inability to receive ACKs when all pbufs are full

[Christopher Head]

Follow-up Comment #1, bug #61097 (project lwip):

I realized later on that everything I just said only applies if you do
full-stack zero-copy receives, by having the application keep the pbufs it’s
given in the tcp_recv callback until it’s ready to process them. If the
application instead adds a copying step, where it copies data from those pbufs
into a separate buffer, then that separate buffer only needs to be one
window-size long, it doesn’t need to be one window-size times the receive
chunk size; so, if you’re OK with losing full zero-copy, this isn’t
actually a big problem (and saying that each socket needs a window-sized
buffer is totally reasonable).

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