June 4, 2026
Fast, Furious, and Slightly Cursed
thunderbolt-ibverbs: We have InfiniBand at home
This DIY speed hack has people cheering the chaos and begging for the safer version
TLDR: A developer used mostly AI-written code to make two small computers share data far faster than normal home networking, turning a consumer cable into a budget high-speed link. Commenters loved the honesty and wild ambition, but some immediately argued a newer Linux method could do it cleaner and better.
A developer just pulled off the kind of stunt that makes the internet yell “this is either genius or a beautiful disaster”. The project basically tricks two small PCs connected by Thunderbolt into acting like they have a fancy super-fast data link usually found in expensive server gear. Translation for normal humans: it made two compact computers talk to each other way faster than regular home networking, which is a huge deal for sharing heavy AI workloads.
But the real popcorn moment is the disclaimer. The creator openly says the code was mostly AI-generated, probably contains nonsense, and is “not for human consumption.” That honesty absolutely lit up the crowd. One camp was instantly charmed, praising the rare “yes, this may break horribly” energy and calling it refreshingly candid in a world where people usually oversell half-baked projects. The vibe was basically: bold idea, no ego, we respect the hustle.
Then came the classic comment-section plot twist: the “cool, but actually…” crowd. One of the strongest replies pointed out that this hack still rides on top of Thunderbolt networking, which means extra overhead, and dropped a link to a newer Linux feature that could do this more directly and cleanly. So now the community mood is split between applause for the mad-science demo and excitement that an even slicker, less cursed version may be around the corner. It’s part breakthrough, part meme, part “we have supercomputer vibes at home.”
Key Points
- •The article describes an experimental project, thunderbolt-ibverbs, documented as a technical report covering its motivation, process, and learnings.
- •The author states that all code in the repository was AI-generated, primarily with Codex 5.5 and Opus 4.7, and warns that it may contain errors and hallucinations.
- •The project uses a Linux kernel module and userspace shim to present a generic USB4 connection as a low-latency, high-performance InfiniBand device.
- •The setup was used for distributed inference across two 128GB Strix Halo mini PCs, and the article says basic interoperability with Apple’s native protocol works.
- •Reported benchmarks include about 48 Gb/s per direction and about 95 Gb/s bidirectional sustained ib_write_bw, plus about 7 µs one-way ib_write_lat, outperforming the Ethernet and soft-RoCE comparisons listed in the article.