Download speeds issue with Proxmox/Virtio



  • 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?


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