Tested with my SonnetTech T3 SFP+ adapter connected to MacBook Air. Server is a Synology RS1221+ with dual-SFP+ (link aggregated) connected to a US-16-XG switch via 2 DAC cables. Around 150 feet run from server cabinet to my office using OM3 Duplex 50/125 OFNP LC/LC fiber cables connecting via a patch panel in the basement and in my office.
I always get a bunch of retries with the initial testing.
Accepted connection from 10.0.1.20, port 64219
[ 5] local 10.0.1.15 port 5201 connected to 10.0.1.20 port 64220
[ ID] Interval Transfer Bandwidth Retr Cwnd
[ 5] 0.00-1.00 sec 1.06 GBytes 9.11 Gbits/sec 45 1.22 MBytes
[ 5] 1.00-2.00 sec 1.09 GBytes 9.41 Gbits/sec 0 1.22 MBytes
[ 5] 2.00-3.00 sec 1.10 GBytes 9.42 Gbits/sec 0 1.22 MBytes
[ 5] 3.00-4.00 sec 1.10 GBytes 9.42 Gbits/sec 0 1.22 MBytes
[ 5] 4.00-5.00 sec 1.10 GBytes 9.42 Gbits/sec 0 1.22 MBytes
[ 5] 5.00-6.00 sec 1.09 GBytes 9.41 Gbits/sec 0 1.67 MBytes
[ 5] 6.00-7.00 sec 1.10 GBytes 9.42 Gbits/sec 0 1.67 MBytes
[ 5] 7.00-8.00 sec 1.10 GBytes 9.42 Gbits/sec 0 1.67 MBytes
[ 5] 8.00-9.00 sec 1.10 GBytes 9.42 Gbits/sec 0 1.67 MBytes
[ 5] 9.00-10.00 sec 1.09 GBytes 9.41 Gbits/sec 0 1.72 MBytes
[ 5] 10.00-11.00 sec 1.10 GBytes 9.42 Gbits/sec 0 1.72 MBytes
[ 5] 11.00-12.00 sec 1.10 GBytes 9.42 Gbits/sec 0 1.72 MBytes
[ 5] 12.00-13.00 sec 1.09 GBytes 9.41 Gbits/sec 0 1.72 MBytes
[ 5] 13.00-14.00 sec 1.10 GBytes 9.42 Gbits/sec 0 1.72 MBytes
[ 5] 14.00-15.00 sec 1.09 GBytes 9.41 Gbits/sec 0 1.72 MBytes
[ 5] 15.00-16.00 sec 1.10 GBytes 9.42 Gbits/sec 0 1.72 MBytes
[ 5] 16.00-17.00 sec 1.10 GBytes 9.42 Gbits/sec 0 1.72 MBytes
[ 5] 17.00-18.00 sec 1.10 GBytes 9.42 Gbits/sec 0 1.72 MBytes
[ 5] 18.00-19.00 sec 1.09 GBytes 9.41 Gbits/sec 0 1.72 MBytes
[ 5] 19.00-20.00 sec 1.10 GBytes 9.42 Gbits/sec 0 1.72 MBytes
[ 5] 20.00-21.00 sec 1.10 GBytes 9.42 Gbits/sec 0 1.72 MBytes
[ 5] 21.00-22.00 sec 1.09 GBytes 9.41 Gbits/sec 0 2.64 MBytes
[ 5] 22.00-23.00 sec 1.10 GBytes 9.42 Gbits/sec 0 2.64 MBytes
[ 5] 23.00-24.00 sec 1.10 GBytes 9.42 Gbits/sec 0 2.64 MBytes
[ 5] 24.00-25.00 sec 1.09 GBytes 9.41 Gbits/sec 0 2.64 MBytes
[ 5] 25.00-26.00 sec 1.10 GBytes 9.42 Gbits/sec 0 2.64 MBytes
[ 5] 26.00-27.00 sec 1.10 GBytes 9.42 Gbits/sec 0 2.64 MBytes
[ 5] 27.00-28.00 sec 1.10 GBytes 9.42 Gbits/sec 0 2.64 MBytes
[ 5] 28.00-29.00 sec 1.09 GBytes 9.41 Gbits/sec 0 2.64 MBytes
[ 5] 29.00-30.00 sec 1.10 GBytes 9.42 Gbits/sec 0 2.64 MBytes
[ 5] 30.00-31.00 sec 1.10 GBytes 9.42 Gbits/sec 0 2.64 MBytes
[ 5] 31.00-32.00 sec 1.10 GBytes 9.42 Gbits/sec 0 2.64 MBytes
[ 5] 32.00-33.00 sec 1.10 GBytes 9.42 Gbits/sec 0 2.64 MBytes
[ 5] 33.00-34.00 sec 1.09 GBytes 9.41 Gbits/sec 0 2.64 MBytes
[ 5] 34.00-35.00 sec 1.10 GBytes 9.42 Gbits/sec 0 2.64 MBytes
[ 5] 35.00-36.00 sec 1.10 GBytes 9.42 Gbits/sec 0 2.64 MBytes
[ 5] 36.00-37.00 sec 1.10 GBytes 9.42 Gbits/sec 0 2.64 MBytes
[ 5] 37.00-38.00 sec 1.10 GBytes 9.42 Gbits/sec 0 2.64 MBytes
[ 5] 38.00-39.00 sec 1.09 GBytes 9.41 Gbits/sec 0 2.64 MBytes
[ 5] 39.00-40.00 sec 1.10 GBytes 9.42 Gbits/sec 0 2.64 MBytes
[ 5] 40.00-41.00 sec 1.10 GBytes 9.42 Gbits/sec 0 2.64 MBytes
[ 5] 41.00-42.00 sec 1.10 GBytes 9.42 Gbits/sec 0 2.64 MBytes
[ 5] 42.00-43.00 sec 1.10 GBytes 9.42 Gbits/sec 0 2.64 MBytes
[ 5] 43.00-44.00 sec 1.10 GBytes 9.42 Gbits/sec 0 2.64 MBytes
[ 5] 44.00-45.00 sec 1.09 GBytes 9.41 Gbits/sec 0 2.64 MBytes
[ 5] 45.00-46.00 sec 1.10 GBytes 9.42 Gbits/sec 0 2.64 MBytes
[ 5] 46.00-47.00 sec 1.10 GBytes 9.42 Gbits/sec 0 2.64 MBytes
[ 5] 47.00-48.00 sec 1.10 GBytes 9.42 Gbits/sec 0 2.64 MBytes
[ 5] 48.00-49.00 sec 1.10 GBytes 9.41 Gbits/sec 0 2.64 MBytes
[ 5] 49.00-50.00 sec 1.09 GBytes 9.41 Gbits/sec 0 2.64 MBytes
[ 5] 50.00-51.00 sec 1.10 GBytes 9.42 Gbits/sec 0 2.64 MBytes