inet buffer size for TCP

[Frank Muller]

Hi all

The inet (
http://erlang.org/doc/man/inet.html
) documentation states :

{buffer, Size}

    The size of the user-level buffer used by the driver. Not to be
confused with options sndbuf and recbuf, which correspond to the Kernel
socket buffers. For TCP it is recommended to have val(buffer) >=
val(recbuf) to avoid performance issues because of unnecessary copying. For
UDP [...]


Question: which is best here:

val(buffer) = val(recbuf)

val(buffer) = val(recbuf) + (1/4 *val(recbuf))

val(buffer) = val(recbuf) + (2/4 *val(recbuf))

val(buffer) = val(recbuf) + (3/4 *val(recbuf))

val(buffer) = 2 * val(recbuf)

Is there any optimal value?

/Frank
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