network performance issue, low bandwidth

[spark5]

hi all ... i searched a lot, but did not find a solution or explanation.
hope somebody can help me.

actually we are running a couple of opnsense cluster on proxmox ve with a some vlans.
we found out, that our bandwidth through the firewall is near 3 gbit/s (all 10gbit/s interfaces).

now, i was starting to test something (all iperf default settings):
2 linux vms, iperf traffic routed via opnsense vs. linux router

# linux vm via proxmox
## vlan config in proxmox, interface via vlan tag
19-22 gbit/s
## vlan in vm, vlan aware bridge
12-13 gbit/s

# opnsense 22.7 vm via proxmox
## vlan config in proxmox, interface via vlan tag
4 gbit/s
## vlan in vm, vlan aware bridge
3 gbit/s (2.8)

# opnsense 22.7 bare metal without virtualisation
6 gbit/s

# opnsense 23.7 bare metal without virtualisation
6 gbits/s

# linux bare metal without virtualisation
10 gbit/s

i'm confused and i dont know whats wrong there.
the hardware is: Intel Corporation Ethernet Controller 10G X550T

if you need some more info, ask me.

thank you all for helping us out-

kind regards,
ronny

[tverweij]

Are you using IPS scanning?

[spark5]

hi, no, i was testing with an opnsense live iso and configured only network interfaces, set firewall allow and started iperf.
this is so strange ... i would like to try a plain freebsd, but this could be an answer, but no solution.

thanks for help

ronny

Are you using IPS scanning?