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seems the network latency would break the realtime expectations of high data rate USB 3.0 hardware on the USB bus.

and using a still image from a webcam seems like the worst use case... there are much better protocols for serving video streams.

One of the more compelling use-cases for USB over IP is connecting proprietary licensing dongles to virtual machines.

can't you use vt-d and have it passthrough?

That still ties it to a physical VM host doesn't it - what happens if you want to host the VM in a cluster and have it migrate?

You don't even need VT-d for USB devices, only PCI one.

Are those still commonly used?