inet buffer size for TCP

[Frank Muller]

Ok, thanks.

/Frank


>
> On Thu, Dec 12, 2019 at 7:43 PM Frank Muller <frank.muller.erl@REDACTED>
> wrote:
>
>> 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?
>>
>
> Not a general optimal value. It will depend on what data you are sending
> and which packet mode you are using. If not using any packet mode (aka
> raw), then I would say that "val(buffer) = val(recbuf)" should be the best
> option.
>
>
>>
>> /Frank
>>
>>
>>
>>
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