Here is what I've got.
- CRS317 + 2 x S+RJ10, both L2MTU are set to 10218;
- Windows 10, X550, MTU 1500, 3m UTP5 patch cord (manufactured);
- Centos 7, X540, ixgbe last vesrion, MTU 9000, ~5m UTP6 patch cord (self-made);
iperf3 -c 192.168.1.4 -t 30
Connecting to host 192.168.1.4, port 5201
[ 4] local 192.168.1.10 port 59788 connected to 192.168.1.4 port 5201
[ ID] Interval Transfer Bandwidth Retr Cwnd
[ 4] 0.00-1.00 sec 1.04 GBytes 8.97 Gbits/sec 0 261 KBytes
[ 4] 1.00-2.00 sec 1.05 GBytes 9.03 Gbits/sec 0 261 KBytes
[ 4] 2.00-3.00 sec 1.06 GBytes 9.08 Gbits/sec 0 261 KBytes
[ 4] 3.00-4.00 sec 1.07 GBytes 9.22 Gbits/sec 0 261 KBytes
[ 4] 4.00-5.00 sec 1.07 GBytes 9.15 Gbits/sec 0 261 KBytes
[ 4] 5.00-6.00 sec 1.07 GBytes 9.15 Gbits/sec 0 261 KBytes
[ 4] 6.00-7.00 sec 1.05 GBytes 9.06 Gbits/sec 0 261 KBytes
[ 4] 7.00-8.00 sec 1.05 GBytes 9.04 Gbits/sec 0 261 KBytes
[ 4] 8.00-9.00 sec 1.06 GBytes 9.14 Gbits/sec 0 261 KBytes
[ 4] 9.00-10.00 sec 1.07 GBytes 9.17 Gbits/sec 0 261 KBytes
[ 4] 10.00-11.00 sec 1.07 GBytes 9.22 Gbits/sec 0 261 KBytes
[ 4] 11.00-12.00 sec 1.06 GBytes 9.10 Gbits/sec 0 261 KBytes
[ 4] 12.00-13.00 sec 1.06 GBytes 9.11 Gbits/sec 0 261 KBytes
[ 4] 13.00-14.00 sec 1.07 GBytes 9.17 Gbits/sec 0 261 KBytes
[ 4] 14.00-15.00 sec 1.07 GBytes 9.16 Gbits/sec 0 261 KBytes
[ 4] 15.00-16.00 sec 1.07 GBytes 9.17 Gbits/sec 0 261 KBytes
[ 4] 16.00-17.00 sec 1.06 GBytes 9.07 Gbits/sec 0 261 KBytes
[ 4] 17.00-18.00 sec 1.07 GBytes 9.19 Gbits/sec 0 261 KBytes
[ 4] 18.00-19.00 sec 1.07 GBytes 9.15 Gbits/sec 0 261 KBytes
[ 4] 19.00-20.00 sec 1.05 GBytes 9.01 Gbits/sec 0 261 KBytes
[ 4] 20.00-21.00 sec 1.06 GBytes 9.14 Gbits/sec 0 261 KBytes
[ 4] 21.00-22.00 sec 1.07 GBytes 9.16 Gbits/sec 0 261 KBytes
[ 4] 22.00-23.00 sec 1.06 GBytes 9.11 Gbits/sec 0 261 KBytes
[ 4] 23.00-24.00 sec 1.06 GBytes 9.08 Gbits/sec 0 261 KBytes
[ 4] 24.00-25.00 sec 1.06 GBytes 9.12 Gbits/sec 0 261 KBytes
[ 4] 25.00-26.00 sec 1.07 GBytes 9.17 Gbits/sec 0 261 KBytes
[ 4] 26.00-27.00 sec 1.06 GBytes 9.07 Gbits/sec 0 261 KBytes
[ 4] 27.00-28.00 sec 1.06 GBytes 9.12 Gbits/sec 0 261 KBytes
[ 4] 28.00-29.00 sec 1.06 GBytes 9.08 Gbits/sec 0 261 KBytes
[ 4] 29.00-30.00 sec 1.06 GBytes 9.06 Gbits/sec 0 261 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-30.00 sec 31.8 GBytes 9.12 Gbits/sec 0 sender
[ 4] 0.00-30.00 sec 31.8 GBytes 9.11 Gbits/sec receiver
[code]