[SOLVED] Low PFSense Proxmox network performance


New Member
Mar 29, 2023
Dear all, I recently changed my physical pfsense by virtualizing it on Proxmox, after that using 3 Gigabit network interfaces when I do a speed test on the links the speed does not exceed 100 Mbps. However, in the PFSense web interface, the cards appear with speeds of 10Gbps if there is something to be done because this way I cannot use the full speed of the links I have.


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You should get full rate in pfSense assuming you have the resources to handle it, which I'm guessing you do.

Some obvious questions:

1. Has your host NIC negotiated at > 100Mbps?
Yes, according to the attached print, pfsense is communicating at 1000Mbps

2. Did you follow the Netgate guide and disable hardware checksums? [https://docs.netgate.com/pfsense/en...ble-hardware-checksums-with-proxmox-ve-virtio]
Adjusted according to Proxmox documentation.

3. What resources have you allocated to pfSense? What's CPU use during saturation?
Below is a printout of the PFSense configuration summary.

Below are the prints relating to your questions:


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Ok, all looks sensible there.

Without knowing what host CPU, I'd say that's pretty high CPU use (3 CPUs though - what! where is your OCD?) if you're only pushing through 100Mbps; I think I'm struggling to top 20% over 2 vCPU (from an i7-7700) with a 500Mbps downlink.

What about LAN-side NIC? Can you transfer a file to/from pfSense from inside the network and see how that performs?
Hello Wallace, issue resolved after conducting some internal tests. I detected packet loss on the internal network interface (LAN) and replaced the interface, which has resolved the problem. Thanks to everyone for the feedback.
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