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Proxmox 10Gb/bit network speed is stuck at around 400Mb

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Hey, I'm having a network issue that's starting to drive me crazy. The server can't maintain a stable throughput above ~300 Mbits/sec (upload file, content, ...). The server is a Proxmox (8.2.7, kernel 6.8.12-2-pve) with a network card (AQC100 10GB).

If I do a local test (10 Gb <-> 2.5 Gb), there’s no problem. But if I try to communicate outside the local network (e.g., to a public iperf server), the speed collapses.

- I’ve already changed the cables between the switches and the router.
-...

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