Proxmox VE update to 9.1.5, now the network card is slow

[alia80]

Hello,
I recently did an in place upgrade to PVE 9, everything seems to be working fine but now the network card seems to be slow. I run pfSense in a VM with a couple of network interfaces passed through. I have not made any changes to the VM recently and no hardware change to the system but the internet through put on the WAN is down to 25% the normal bandwidth. I have ruled out the ISP by checking the bandwidth directly using a laptop and used iperf3 to test the connection between the PC and the router. Everything seems to be working fine, the only thing that changed was the PVE upgrade to version 9.

Does anyone have any suggestions as to what could have caused this issue?

Thanks.

 

[alia80]

Additional info:

lspci | grep -i ethernet
01:00.0 Ethernet controller: Broadcom Inc. and subsidiaries NetXtreme BCM5720 Gigabit Ethernet PCIe
01:00.1 Ethernet controller: Broadcom Inc. and subsidiaries NetXtreme BCM5720 Gigabit Ethernet PCIe
02:00.0 Ethernet controller: Broadcom Inc. and subsidiaries NetXtreme BCM5720 Gigabit Ethernet PCIe
02:00.1 Ethernet controller: Broadcom Inc. and subsidiaries NetXtreme BCM5720 Gigabit Ethernet PCIe

ethtool vmbr2
Settings for vmbr2:
        Supported ports: [  ]
        Supported link modes:   Not reported
        Supported pause frame use: No
        Supports auto-negotiation: No
        Supported FEC modes: Not reported
        Advertised link modes:  Not reported
        Advertised pause frame use: No
        Advertised auto-negotiation: No
        Advertised FEC modes: Not reported
        Speed: 10000Mb/s
        Duplex: Unknown! (255)
        Auto-negotiation: off
        Port: Other
        PHYAD: 0
        Transceiver: internal
        Link detected: yes