Comment 68 for bug 1667750

And here it is of kernel 4.4:

bram@escher:~$ uname -a
Linux escher 4.4.0-87-generic #110-Ubuntu SMP Tue Jul 18 12:55:35 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
bram@escher:~$ iperf -c 192.168.10.5
------------------------------------------------------------
Client connecting to 192.168.10.5, TCP port 5001
TCP window size: 85.0 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.10.124 port 42372 connected with 192.168.10.5 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 670 MBytes 561 Mbits/sec
bram@escher:~$

Seems like there's not much of a difference, so I might be wrong (initially tested with a public FTP of a client in Spain I have no access to)