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Ranch is merely a socket acceptor pool. Condor takes care of framing and buffering, also.

Doesn't native erlang handle that? With {packet, Len} and {active, once}?

Not the buffering.

You can set a user level buffer size of the socket driver, and a receive buffer size (see http://erlang.org/doc/man/inet.html).

Why is another level of buffering needed?