[qdr] Two-Router TCP Connection Rate Test

[Michael Goulish <mg...@redhat.com>]

What rate of new connection creation can a two-router network sustain
through their TCP adapters?

*165 connections per second*, measured at the TCP server.
This rate was sustained with *little variation for 100,000 connections*.

This took about 603 seconds.
The router's memory kept growing occasionally, but it looks like it is
levelling off over time just as I saw in the recent long-term soak test.


The test:

* The two routers are running on separate machines, talking to each other
over a 40 Gbit link.

* The TCP client and server are written in Go. The client connects to the
server and then immediately closes the connection.  The server accepts
connections and immediately closes them.

* The limiting factor was indeed the router network, because when the two
Go programs talked directly to each other over the same link, connection
creation rate was about 1200 per second.