Link Wars: The Semantic Crisis. Is the debate over or is it just beginning?
Paul Borrill

TL;DR
This paper highlights a semantic crisis in networking interconnects caused by vendor-specific divergence and proposes explicit, minimal link semantics and Open Atomic Ethernet as solutions to improve reliability and interoperability.
Contribution
It identifies the root cause of the semantic crisis in current fabrics and introduces explicit link semantics and Open Atomic Ethernet to address fragmentation.
Findings
Semantic crisis pervades networking stack
Explicit link semantics can improve correctness
Open Atomic Ethernet offers a potential standard
Abstract
For fifty years, networking has fragmented whenever new workloads exposed hidden assumptions about time, ordering, failure, and trust. This paper argues that the current interconnect landscape -- NVLink, UALink, Ultra Ethernet, AELink/Aethernet, TTPoE, and classical RDMA -- suffers from a semantic crisis: vendor-specific divergence disguised as optimization. We trace this crisis to the Forward-In-Time-Only (FITO) category mistake embedded in every major fabric stack, and show how each pathology -- aspirational RDMA completion, fire-and-forget GPU semantics, opaque proprietary stacks, incompatible multi-cloud ordering, universal fencing -- arises from the same failure to define explicit, testable link semantics from APIs to bits on the wire. We conjecture that RDMA achieves reliability through universal fencing that collapses concurrency into serialized checkpoints, and that precise…
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Taxonomy
TopicsSpace Technology and Applications · Advanced Data Storage Technologies · Distributed systems and fault tolerance
