What's the purpose of use_socket_read_watermark

Question

How to use this parameter and why should we use it?

in config.ini there is a experimental parameter for

socket read watermark optimization

use-socket-read-watermark = 0
in net_plugin.cpp under plugin

bool use_socket_read_watermark = false;

Answer 1

The option appears to have been introduced in v1.0.4, and it enables low-water marks for socket communication to minimise the number of send calls required to get a minimum number of bytes (i.e. enable faster communication.) However, this is not widely supported; poll(2) in Linux ignores SO_RCVLOWAT, but OS X may support it.