add iperf

README.md

@@ -33,4 +33,5 @@ A collection of awesome performance testing resources
 * [cassowary](https://github.com/rogerwelin/cassowary) - Cassowary is a modern HTTP/S, intuitive & cross-platform load testing tool built in Go for developers, testers and sysadmins. Cassowary draws inspiration from awesome projects like k6, ab & httpstat.
 * [slowhttptest](https://github.com/shekyan/slowhttptest) - SlowHTTPTest is a highly configurable tool that simulates some Application Layer Denial of Service attacks by prolonging HTTP connections in different ways. Use it to test your web server for DoS vulnerabilites, or just to figure out how many concurrent connections it can handle
 * [autocannon](https://github.com/mcollina/autocannon) - An HTTP/1.1 benchmarking tool written in node, greatly inspired by wrk and wrk2, with support for HTTP pipelining and HTTPS. On my box, autocannon can produce more load than wrk and wrk2, see limitations for more details.
-* [vegeta](https://github.com/tsenart/vegeta) - Vegeta is a versatile HTTP load testing tool built out of a need to drill HTTP services with a constant request rate.
+* [vegeta](https://github.com/tsenart/vegeta) - Vegeta is a versatile HTTP load testing tool built out of a need to drill HTTP services with a constant request rate.
+* [iperf](https://github.com/esnet/iperf) - iperf3: A TCP, UDP, and SCTP network bandwidth measurement tool. iperf is a tool for active measurements of the maximum achievable bandwidth on IP networks. It supports tuning of various parameters related to timing, protocols, and buffers. For each test it reports the measured throughput / bitrate, loss, and other parameters.