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PCIE passthrough NIC (SFP+ card) - very slow performance

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Here's what I have:

Proxmox installed on a very powerful machine (RAM/CPU-wise). I have granted generous amount of CPU + RAM to pfSense guest.

Now I have a 10gb uplink 9000 MTU connection for WAN. It's fiber / SFP+. I am doing full PCIe passthrough. (all functions of card selected, PCIe selected)

Everything seems to be choppy. Download speed is almost capped at 600Mbps-ish, upload is capped almost at 200Mbps-ish. It should be at least 940/940 (have done the test with a laptop, bypassing...

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