Slow network performance

[djkay2637]

Good afternoon collective minds.

I am having issues, i believe with, network performance. When I conduct a iperf3 test, I am only about to get about 1.6gbps across my 10gbe homelab network. What I have done so far:

My highspeed network from my Proxmox was on cat6. it goes under my lawn and into my shed server room. Everything was negotiated at 10gbe according to unifi but my initial thoughts could be electrical interference as to why the speeds are lower. Since then, i have dug a run around my garden, run 2 sets of fiber and installed a 82599es x520 SFP+ nic to my proxmox server. To eliminate switch issues i purchased a Unifi Aggregation switch with a unfi rj45 module to my 10gbe network card in my PC. i have tried other branded rj45 modules too. Despite these upgrades, the speed is still similar. Drivers are all up to date, tried in Windows 10 and Ubuntu as the iperf3 client. Any suggestions?



Kind regards,
Dan

 

[_gabriel]

tried in Windows 10 and Ubuntu as the iperf3 client

As VM within Proxmox or external ?
inter VM communication within Proxmox VE are bounded to CPU because "switch" is virtual using Linux Bridge.

 

[djkay2637]

As VM within Proxmox or external ?
inter VM communication within Proxmox VE are bounded to CPU because "switch" is virtual using Linux Bridge.

Great question. Apologies for not including this. I have tested the external client running Windows 10 and Ubuntu on bare metal. THis is connected to the Agg switch, nothing else in-between both copper and fiber. This is testing ProxmoxVE itself and i have also tested a VM on this server too.

 

[_gabriel]

1/ Try with iperf3 version at least 3.16 where -P is multi threads CPU additionnal to multi streams.
What is PVE host CPU ?

2/ Try direct connection.

 

[djkay2637]

Thanks for your reply. I am running iperf3 v3.18. when running 5 parallel connections i am now getting 3.06 Gbits/sec which is better but still quite a way off.

I have tried with a cat6 link to the Proxmox server and now with fiber. Both same speeds. I am using a intel x520 nic on the PC which is rj45. I have run iperf3 from my PFSense firewall (bare metal) which is DAC to the Unifi Agr switch and from PFSense to Proxmox getting 4.54Gbits/sec. From PC to PFsense i am getting 2.59 Gbits/sec. Most odd.

Thanks again.