Q: Testing network equipment, TCP window size matters We are currently testing some network equipment (consumer routers with 1 Gbit/s ports) with Jpef 2.0. All kinds of connection parameters are tested: wired and wireless, different wireless standards, TCP/UDP, etc.
When not specifying a TCP window size, the performance is low (300 mbit/s). If you enter a high value, the throughput is much better (900 mbit/s). Google tells that Windows uses TCP Window Scaling, there is no "standard" TCP Window size.
What should we use as the TCP Window size in Jperf?

A: Tried to find a good reference for you, but the best one that I found was this. On my opinion Jperf leaves this value "open for edit" only because this way be a parameter important to test networks in some specific way. I mean, this should be a choice of the tester so you could find the best value for your the network you are testing and trying to improve or adjust. I just reccomend you to read most of everything you could find about this and try to test different values until you reach the best one for you.
