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No problem! I've seen many others on the net with the same issue so I figured I'd better share :)

I'm glad I figured it out too! It was driving me nuts! :D

Thanks for all the suggestions...

I just wanted to add a note here that I have just discovered that currently, iPerf3 v3.1.3 for Windows comes bundled with a version of Cygwin1.dll (2.5.1) which has a hard-coded TCP window size...

I'd be interested in hearing from anyone who has managed to get Windows working at high speed (>500mbit) with a high latency destination (>100ms), just to compare notes.

I've tested this on...

I've played with NIC buffers too; up to 2048(KB?) - no change.

Ok, I'll look at that.

I have however tried different congestion avoidance algos in Windows, but it didn't make any difference, at least not with 30 second iperf tests.

How long would you...

Well, since it works fine in Linux, I expect that the routers are not to blame in this case.

Yes, I've tried optimal.

I'm concerned that the RWIN may not be scaling enough considering that in my case it needs to 11MB...

I have been measuring my speed using a number of different...

Hey guys,

I have a tricky issue and I need the help of your networking expertise!


Problem:
I am located in New Zealand and get virtually full line speed to the US (west coast) when running...