A single flapping link can stall a synchronized AI training step and idle thousands of healthy GPUs. Zero-Flap is engineered, in hardware and software, to stop the flap before it cascades. Press play and watch the difference.
Each square is a GPU; the lines are optical links carrying a synchronized all-reduce — every GPU must finish together before the next training step starts. One link down stalls the whole step. Toggle the optics and watch utilization.
Zero-Flap is a system, not a component. It attacks instability at the three layers Credo can control. That integration is the moat — far more than any single part.
Silicon photonics (from the Dust Photonics acquisition) integrates the optics onto a chip and uses substantially fewer lasers per link — the laser is the least reliable part. Fewer lasers means better power, lower cost, and less exposure to the laser supply shortage. The DSP is tuned for link stability, not just raw throughput.
The PILOT software, integrated at the switch via the SDK, continuously reads link-health telemetry — bit-error rates, signal-quality histograms, laser-degradation signals. It is the check-engine light for the optical link: it sees the signals that precede a failure and mitigates the instability before the link drops the cluster. Prevention, not cleanup.
Because Credo controls both the DSP and the photonic integrated circuit (PIC), it gets tighter DSP-to-PIC integration than a vendor selling one piece. Tighter integration means richer telemetry, deeper diagnostics, and system-level optimization a component supplier cannot match. This hardware integration is the durable moat; the software is the contestable layer.
Credo's CEO has said one customer was losing 20–30% of its productivity to link flaps before deploying the Zero-Flap approach. Reliability is not a feature here; it is the limiting factor on usable compute. Set your fleet and the flap tax.
Zero-Flap aims to recover most of the lost slice. The point is not that flaps are common; it is that at cluster scale a small per-link probability compounds into a large idle fleet.