I believe I understand. By not allocating in the api call itself you can pre-allocate your own buffers and keep track of which are in-use and not in-use yourse

I believe I understand. By not allocating in the api call itself you can pre-allocate your own buffers and keep track of which are in-use and not in-use yourself and use some subset of the total amount that would be allocated in each api call be reusing buffers after a particular connection is done with it. That makes sense.