Meta slashes ad latency 28% with custom BPF scheduler
Meta swapped the stock Linux scheduler for a BPF‑based policy built on sched_ext after a kernel upgrade spiked ad‑serving latency. The custom scheduler cut the 99th‑percentile retrieval latency by 28%, saved 3.28 MW of power and lifted the ads‑ranked count 1.1%, directly boosting revenue. At over 5 million requests per second, those milliseconds translate to billions in ROI.