Hi, I'm Daniel Havey from Microsoft Windows. I'm the PM for transports (TCP/QUIC) and there is a bug in the cygwin1.dll that was distributed with the iperf binaries. The bug limits maximum bandwidth achievable by the iperf tool. Details can be found in my blogpost: https://techcommunity.microsoft.com/t5/networking-blog/windows-network-performance-suffering-from-bad-buffering/ba-p/339668
We worked with RedHat on Cygwin to fix the bug, but I am still getting reports of limited bandwidth from windows iperf users. The fix is simple. Just download the new cygwin1.dll from the cygwin website and the problem will be fixed. thanks ;) ...Daniel
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