I'm sad to say that the issue is back. Whatever it is, it's definitely Windows shenanigans as Linux live boot saturates the link but Win continues to peak at ~50Mbps.

YES! Changed it to ffffffff and now I'm getting nice and consistent 500mbps uploads to a slow laptop! THANK YOU!

This is definitely a Windows issue. Here are the results from live booting Linux Mint with server running on a Windows laptop -


mint@mint ~/Desktop/Qfinder $ iperf3 -c 192.168.2.150
Connecting...

I'm about to try live booting Mint Linux but here's what I have for now... I'm blaming Windows networking more and more now.


This is from Win laptop to Win desktop direct connection -
...

Nope, not it. All is set to 1000FD.

Hey,

I wish I could blame the router, but it's not even in the play. Everything is connected using GBe switch and even when I took that out of the equation, everything still stayed the same. FTP...

Update: see iperf tests below. Issue appears to be OS-related. No speed problems on Linux boxes, Windows causes upload slowdown.

Issue: using local gigabit network uploads peak at 7-10MB/s while...