Post #2980186
2026-03-23 10:42 UTC
Just spent all evening trying to reverse-engineer how "RDMA over Thunderbolt 5" works, only to discover that there isn't any RDMA at all (at a hardware level it's just a second USB4NET-style connection, except macos lets you put the ring buffers in your userspace program's memory, so it's zero-copy and doesn't touch the kernel network stack). Entirely unclear why it's TBT5-exclusive…
Replies (1)
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@jamie@social.memes.nz 2026-03-23 10:44
but now i'm entirely uninterested, since you can't read or write memory remotely, or do cool low-latency distributed systems stuff, it's just a high-throughput unreliable pipe between two userspace programs :c