fabric latency must name its measurement boundary: NVIDIA cites about 100 ns for an InfiniBand switch hop and about 1 microsecond in application-latency examples; NIC-to-NIC and RoCEv2 results are topology, NIC, software and workload specific
~100 ns switch hop; ~1 us cited application exampleobserved
| Value kind | observed — Reported measurements, counts, and specifications keep the precision and scope stated by their source; an exact specification is not treated as a range. |
|---|---|
| Scope | Do not compare switch port-to-port latency with end-to-end application or WAN latency. |
| As of | 2026-08-24 |
| Source | NVIDIA, Introduction to InfiniBand for End Users · Switch-hop and application-latency examples; measurement boundaries differ |
| Review | checking…review by 2026-12-22 · standard cadence |
| Recorded changes | last 2026-08-24 · 2 revisions tracked |
| Claim id | per-hop-fabric-latency-infiniband-1-2-us-tuned |
Where the guide uses it
← Full numbers register — every date-stamped figure in the guide, with revision history.