Another Thunderbolt Networking Thread ...

[ResonantEcho]

I’ve set up Thunderbolt networking on two 10th-gen Intel NUCs using Thunderbolt 3, but I’m only getting an average throughput of 35-40 Mbps in iperf3 tests. I’ve double-checked all the settings multiple times and tried two different Thunderbolt 4 cables. I've tried a few different Proxmox kernels suggested in other forums, etc. Any suggestions?

 

[Finale3333]

Run these commands on PVE hosts and provide the output.

modinfo thunderbolt

lspci -vP | grep Thunderbolt

Are you perf testing directly from PVE host to PVE host or are did you put a linux bridge on the PVE hosts and spin up VMs on each PVE host and you're perf testing there?

If you're perf testing from VMs on the PVE hosts try disabling tcp segmentation offload inside the VMs

ethtool -K <interface> tso off

Run this on the PVE host with one of the thunderbolt interfaces and show output of the thunderbolt interface and the linux bridge if using one

ethtool --show-features <thunderbolt0>