alt Hacker News> traditional Thunderbolt networking protocol ... performance may be as low as that of a 10 Gb/s Ethernet interface.
Ouch. Why so much lower than the physical bandwidth (or what they've achieved here)?
> traditional Thunderbolt networking protocol ... performance may be as low as that of a 10 Gb/s Ethernet interface.
Ouch. Why so much lower than the physical bandwidth (or what they've achieved here)?
A USB4 40Gbps cable consists of two 20G tx/rx pairs. The in-kernel networking implementation is single-stream and just uses one pair, and won't e.g. stripe across both pairs or across multiple cables, which was the main bandwidth unlock in TFA. Doing so would be a much more complicated undertaking, since now you've re-introduced out-of-order delivery which complicates re-assembly of large packets, retries, handling loss etc. The verbs interface is a lot simpler than that of a full IP stack, so although was possible to get this working across rails, may not be so simple for something pretending to be ethernet.