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Thank you @mb,

Any reason why Netmap may be applying two different number of descriptors? Is this something that depends on the hypervisor or OPNsense to decide?

The reason why I'm trying to troubleshoot this is that my internet connection is symmetrical gigabit and while my upload speeds reach 940Mbps, my download speeds are capped at 700-900Mbps, something definitely seems wrong. All hardware offload settings/features are disabled for both OPNsense and the host, but I can't find a way to force higher txd/rxd parameters.

Not sure if this would be the right place to post, but netmap is reporting this for my virtio interfaces:

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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? This is an OPNsense VM running in KVM (Proxmox). Ring parameters for the interface in the host are set to 2048:

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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

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