CARD · Card record
MetaRoCE: a clean-sheet RDMA transport for AI-scale Ethernet, spec open-sourced
Meta designed MetaRoCE, a clean-sheet RDMA transport for AI workloads on commodity Ethernet: congestion control and path selection move to the endpoints, with native out-of-order delivery, multipath, and lossy-Ethernet tolerance without PFC, claimed to hold throughput and tail latency at million-GPU scale. The spec, a reference implementation, and a compliance test suite are released through the Open Compute Project.
01
THE STORY · The original
Read the explanation and its limits.
- Originalpress reporthttps://engineering.fb.com/2026/08/24/networking-traffic/metaroce-rdma-transport-ai-ethernet
Why it is worth understanding
Networking is now a visible bottleneck for large-scale training; an open, PFC-free spec gives self-built training and inference clusters a new baseline to compare against.
Conditions and limitations
Performance claims all come from Meta's own blog and clusters — not proof from independent re-tests; engineering.fb.com is restricted in mainland China, so the AIHOT Chinese digest is attached as a reachable reading path. Real cross-vendor compatibility still awaits OCP-ecosystem validation.
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02
THE THREAD · Full timeline
1 event, every row traceable.
A card accumulates records as its story develops: new corroborators, market contrasts, material changes at the original — each dated and linked to its archive day.
- Added to BitShovelEntered the BitShovel radar: 37 entries visible on AIHOT featured at collection.
03
SOURCES · Sources and evidence
Check each link's purpose and limits.
Sources and evidence · 2 links
Each link has a purpose and scope. Link counts do not establish independent confirmation; direct support applies only to the statements specified below.
- Meta engineering blog via AIHOT featuredScope not documented
A per-link statement of support has not been attached.
- AIHOT featured (Chinese digest)Scope not documented
A per-link statement of support has not been attached.