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Network Bandwidth Expectations

Network Bandwidth Expectations

Owned by Chris Green
Jun 28, 2023
2 min read

What sort of network performance should I expect?

The network bandwidth available to VMs will depend on the type of network your VMs are on and the contention on the hypervisor on which your VM is running:

Internal (172.16.*.*):

Private (project private networks eg 10.*.*.* or 192.168.*.*):

How can I test network bandwidth?

The best way to test network bandwidth is with iperf3. You will need two hosts, the location of these hosts will vary depending on what you are trying to test. If you want to test connection to an STFC service please contact us and we can arrange one of the hosts for testing.

On both hosts install iperf3

yum install iperf3 -y

On one host (the server) start iperf3 in server mode (if we are providing a host to test with skip this)

iperf3 -s

On the second host (the client) start

iperf3 -c <ip of your first machine>

On the client side you should see an output like this:

[root@test-private-network-3-1 ~]# iperf3 -c 192.168.248.65 Connecting to host 192.168.248.65, port 5201 [ 4] local 192.168.248.52 port 51932 connected to 192.168.248.65 port 5201 [ ID] Interval Transfer Bandwidth Retr Cwnd [ 4] 0.00-1.00 sec 1.87 GBytes 16.0 Gbits/sec 75 1.66 MBytes [ 4] 1.00-2.00 sec 2.10 GBytes 18.0 Gbits/sec 159 1.39 MBytes [ 4] 2.00-3.00 sec 2.13 GBytes 18.3 Gbits/sec 53 1.77 MBytes [ 4] 3.00-4.00 sec 2.11 GBytes 18.2 Gbits/sec 256 1.45 MBytes [ 4] 4.00-5.00 sec 2.14 GBytes 18.4 Gbits/sec 32 1.95 MBytes [ 4] 5.00-6.00 sec 2.16 GBytes 18.5 Gbits/sec 209 1.76 MBytes [ 4] 6.00-7.00 sec 2.16 GBytes 18.6 Gbits/sec 6 1.51 MBytes [ 4] 7.00-8.00 sec 2.14 GBytes 18.4 Gbits/sec 110 1.56 MBytes [ 4] 8.00-9.00 sec 2.15 GBytes 18.5 Gbits/sec 46 1.86 MBytes [ 4] 9.00-10.00 sec 2.16 GBytes 18.5 Gbits/sec 42 1.69 MBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bandwidth Retr [ 4] 0.00-10.00 sec 21.1 GBytes 18.1 Gbits/sec 988 sender [ 4] 0.00-10.00 sec 21.1 GBytes 18.1 Gbits/sec receiver iperf Done.

From this you can see that there was an average bandwidth of 18.1 gbps during this test

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