As a first step, I'm trying to verify that setNoDelay is working when set on both client and server:

"use strict";
const net = require("net");
const port = 4000;
let timeClient, timeServer;

function time() {
    let hrtime = process.hrtime();
    return hrtime[0] * 1e9 + hrtime[1];
}

net.createServer(function(socket) {
    socket.setNoDelay(true); // correct?
    timeServer = time();
    socket.write("\0");
    socket.on("data", function () {
        console.log("Client -> Server " + ((time() - timeClient) / 1000).toFixed(0) + "µs");
    });
}).listen(port);

setInterval(function() {
    let socket = new net.Socket();
    socket.setNoDelay(true); // correct?
    socket.on("data", function () {
        console.log("Server -> Client " + ((time() - timeServer) / 1000).toFixed(0) + "µs");
        timeClient = time();
        socket.write("\0");
        socket.end();
    }).connect(port);
}, 200);

Is this the correct usage? @evanlucas maybe you can have a look, as you've dealt with these socket options recently.

edit: updated to measure both delays. also: i fail at math, it's µs :)
edit2: I probably need to send out writes way faster to notice the nagling.

Uh oh!

Uh oh!

net: enable TCP_NODELAY by default on all platforms #906

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