Download speeds issue with Proxmox/Virtio

[elewsmer]

I'm running a pfSense VM in KVM (Proxmox) and I've been trying to troubleshoot a discrepancy in speed tests with this VM, I'm on a gigabit symmetrical connection and connected to the gateway directly I get full 940/940Mbps, in the VM however I get 940Mbps upload and 700-900Mbps download. All hardware offload settings are disabled for both the VM and the host.

Netmap is reporting this at boot:

vtnet0: <VirtIO Networking Adapter> on virtio_pci1
vtnet0: Ethernet address: 00:00:00:00:00:00
vtnet0: netmap queues/slots: TX 4/256, RX 4/128
000.001082 [ 503] vtnet_netmap_attach       vtnet attached txq=4, txd=256 rxq=4, rxd=128

txd and rxd aren't supposed to be the same? Ring parameters for the interface in the host are set to 2048:

Ring parameters for ens4f2:
Pre-set maximums:
RX:		4096
RX Mini:	0
RX Jumbo:	0
TX:		4096
Current hardware settings:
RX:		2048
RX Mini:	0
RX Jumbo:	0
TX:		2048

Multiqueue is set to 4, which pfSense correctly applies, but I read in the Netmap github that both rxd and txd values must be same to avoid issues.
Any thoughts?

[tibere86]

Bumping as I am also interested in this answer.

[tibere86]

@elewsmer How were you able to set vtnet netmap queues to greater than 1 virtualizing with Proxmox? I have tried multiple ways to no avail, pfSense only recognizes one.