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I'm doing Iperf testing at my company's branch office circuit and I'm getting results that are causing me concern.

I'm testing from a laptop through an access switch>distro switch> Fortigate> 10g circuit > Private test server in Azure with a public IP. The throuput in this testing is limited by 1g interface on the access switch. I can get pretty close to the 1G limit but the issues I have to set Iperf to do 50 streams to get that result. the individual streams are only getting 20-25 mbps (summary outputs below). I have done internal testing between Iperf3 servers on the LAN and I can get individual streams of nearly a gig. Does anyone know why I may be getting this result? Could it be my MTU or MSS on the WAN interface?

Test Complete. Summary Results: [ ID] Interval Transfer Bandwidth [ 4] 0.00-10.00 sec 27.2 MBytes 22.9 Mbits/sec sender
[ 4] 0.00-10.00 sec 27.2 MBytes 22.9 Mbits/sec receiver
[ 6] 0.00-10.00 sec 27.0 MBytes 22.6 Mbits/sec sender
[ 6] 0.00-10.00 sec 27.0 MBytes 22.6 Mbits/sec receiver
[ 8] 0.00-10.00 sec 27.2 MBytes 22.9 Mbits/sec sender
[ 8] 0.00-10.00 sec 27.2 MBytes 22.9 Mbits/sec receiver
[ 10] 0.00-10.00 sec 27.4 MBytes 23.0 Mbits/sec sender
[ 10] 0.00-10.00 sec 27.4 MBytes 23.0 Mbits/sec receiver
[ 12] 0.00-10.00 sec 27.2 MBytes 22.9 Mbits/sec sender
[ 12] 0.00-10.00 sec 27.2 MBytes 22.9 Mbits/sec receiver
[ 14] 0.00-10.00 sec 27.4 MBytes 23.0 Mbits/sec sender
[ 14] 0.00-10.00 sec 27.4 MBytes 23.0 Mbits/sec receiver
[ 16] 0.00-10.00 sec 27.4 MBytes 23.0 Mbits/sec sender
[ 16] 0.00-10.00 sec 27.4 MBytes 23.0 Mbits/sec receiver
[ 18] 0.00-10.00 sec 27.4 MBytes 23.0 Mbits/sec sender
[ 18] 0.00-10.00 sec 27.4 MBytes 23.0 Mbits/sec receiver
[ 20] 0.00-10.00 sec 27.0 MBytes 22.6 Mbits/sec sender
[ 20] 0.00-10.00 sec 27.0 MBytes 22.6 Mbits/sec receiver
[ 22] 0.00-10.00 sec 27.2 MBytes 22.9 Mbits/sec sender
[ 22] 0.00-10.00 sec 27.2 MBytes 22.9 Mbits/sec receiver
[ 24] 0.00-10.00 sec 27.1 MBytes 22.7 Mbits/sec sender
[ 24] 0.00-10.00 sec 27.1 MBytes 22.7 Mbits/sec receiver
[ 26] 0.00-10.00 sec 26.9 MBytes 22.5 Mbits/sec sender
[ 26] 0.00-10.00 sec 26.9 MBytes 22.5 Mbits/sec receiver
[ 28] 0.00-10.00 sec 26.9 MBytes 22.5 Mbits/sec sender
[ 28] 0.00-10.00 sec 26.9 MBytes 22.5 Mbits/sec receiver
[ 30] 0.00-10.00 sec 27.0 MBytes 22.6 Mbits/sec sender
[ 30] 0.00-10.00 sec 27.0 MBytes 22.6 Mbits/sec receiver
[ 32] 0.00-10.00 sec 25.8 MBytes 21.6 Mbits/sec sender
[ 32] 0.00-10.00 sec 25.8 MBytes 21.6 Mbits/sec receiver
[ 34] 0.00-10.00 sec 25.6 MBytes 21.5 Mbits/sec sender
[ 34] 0.00-10.00 sec 25.6 MBytes 21.5 Mbits/sec receiver
[ 36] 0.00-10.00 sec 25.8 MBytes 21.6 Mbits/sec sender
[ 36] 0.00-10.00 sec 25.8 MBytes 21.6 Mbits/sec receiver
[ 38] 0.00-10.00 sec 26.8 MBytes 22.4 Mbits/sec sender
[ 38] 0.00-10.00 sec 26.8 MBytes 22.4 Mbits/sec receiver
[ 40] 0.00-10.00 sec 26.5 MBytes 22.2 Mbits/sec sender
[ 40] 0.00-10.00 sec 26.5 MBytes 22.2 Mbits/sec receiver
[ 42] 0.00-10.00 sec 26.4 MBytes 22.1 Mbits/sec sender
[ 42] 0.00-10.00 sec 26.4 MBytes 22.1 Mbits/sec receiver
[ 44] 0.00-10.00 sec 26.0 MBytes 21.8 Mbits/sec sender
[ 44] 0.00-10.00 sec 26.0 MBytes 21.8 Mbits/sec receiver
[ 46] 0.00-10.00 sec 26.9 MBytes 22.5 Mbits/sec sender
[ 46] 0.00-10.00 sec 26.9 MBytes 22.5 Mbits/sec receiver
[ 48] 0.00-10.00 sec 27.0 MBytes 22.6 Mbits/sec sender
[ 48] 0.00-10.00 sec 27.0 MBytes 22.6 Mbits/sec receiver
[ 50] 0.00-10.00 sec 26.9 MBytes 22.5 Mbits/sec sender
[ 50] 0.00-10.00 sec 26.9 MBytes 22.5 Mbits/sec receiver
[ 52] 0.00-10.00 sec 26.5 MBytes 22.2 Mbits/sec sender
[ 52] 0.00-10.00 sec 26.5 MBytes 22.2 Mbits/sec receiver
[ 54] 0.00-10.00 sec 26.4 MBytes 22.1 Mbits/sec sender
[ 54] 0.00-10.00 sec 26.4 MBytes 22.1 Mbits/sec receiver
[ 56] 0.00-10.00 sec 26.6 MBytes 22.3 Mbits/sec sender
[ 56] 0.00-10.00 sec 26.6 MBytes 22.3 Mbits/sec receiver
[ 58] 0.00-10.00 sec 26.6 MBytes 22.3 Mbits/sec sender
[ 58] 0.00-10.00 sec 26.6 MBytes 22.3 Mbits/sec receiver
[ 60] 0.00-10.00 sec 26.8 MBytes 22.4 Mbits/sec sender
[ 60] 0.00-10.00 sec 26.8 MBytes 22.4 Mbits/sec receiver
[ 62] 0.00-10.00 sec 26.4 MBytes 22.1 Mbits/sec sender
[ 62] 0.00-10.00 sec 26.4 MBytes 22.1 Mbits/sec receiver
[ 64] 0.00-10.00 sec 26.6 MBytes 22.3 Mbits/sec sender
[ 64] 0.00-10.00 sec 26.6 MBytes 22.3 Mbits/sec receiver
[ 66] 0.00-10.00 sec 26.6 MBytes 22.3 Mbits/sec sender
[ 66] 0.00-10.00 sec 26.6 MBytes 22.3 Mbits/sec receiver
[ 68] 0.00-10.00 sec 26.8 MBytes 22.4 Mbits/sec sender
[ 68] 0.00-10.00 sec 26.8 MBytes 22.4 Mbits/sec receiver
[ 70] 0.00-10.00 sec 12.4 MBytes 10.4 Mbits/sec sender
[ 70] 0.00-10.00 sec 12.4 MBytes 10.4 Mbits/sec receiver
[ 72] 0.00-10.00 sec 26.9 MBytes 22.5 Mbits/sec sender
[ 72] 0.00-10.00 sec 26.9 MBytes 22.5 Mbits/sec receiver
[ 74] 0.00-10.00 sec 26.6 MBytes 22.3 Mbits/sec sender
[ 74] 0.00-10.00 sec 26.6 MBytes 22.3 Mbits/sec receiver
[ 76] 0.00-10.00 sec 26.8 MBytes 22.4 Mbits/sec sender
[ 76] 0.00-10.00 sec 26.8 MBytes 22.4 Mbits/sec receiver
[ 78] 0.00-10.00 sec 23.8 MBytes 19.9 Mbits/sec sender
[ 78] 0.00-10.00 sec 23.7 MBytes 19.9 Mbits/sec receiver
[ 80] 0.00-10.00 sec 26.8 MBytes 22.4 Mbits/sec sender
[ 80] 0.00-10.00 sec 26.8 MBytes 22.4 Mbits/sec receiver
[ 82] 0.00-10.00 sec 26.6 MBytes 22.3 Mbits/sec sender
[ 82] 0.00-10.00 sec 26.6 MBytes 22.3 Mbits/sec receiver
[SUM] 0.00-10.00 sec 1.03 GBytes 883 Mbits/sec sender
[SUM] 0.00-10.00 sec 1.03 GBytes 883 Mbits/sec receiver
CPU Utilization: local/sender 72.2% (22.6%u/49.7%s), remote/receiver 7.4% (0.8%u /6.6%s)

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  • Hard to tell with the limited info you've provided. Please edit your question to include all device models, relevant configurations, and a simple diagram. We can't just guess. Commented Feb 9, 2024 at 15:31
  • Private test server in Azure with a public IP - you are basically testing your Internet access and Azure bandwidth. Make sure that your test endpoints support the TCP window scale option. Please add the iperf3 commands used to your question as well as the round-trip time between endpoints (at least ping). Commented Feb 9, 2024 at 15:35

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2

In my experience Azure throttle the traffic and you can only achieve limited performance on a single flow.

This is because aside the public access they sell the express route circuit.

If you could achieve 1Gbs connection on public access they would not sell any express route.

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