DevMeta Engineeringabout 7 hours ago
Meta Uses Open-Source Kernel Scheduler for Ads
7 min read
Meta deployed sched_ext, an open-source BPF-based scheduler, to replace general-purpose Linux schedulers for its ads serving fleet. The custom policy reduced p99 latency by 28%, saved 3.28 megawatts of power, and increased ads ranked by 1.1%. Scheduler updates now ship in days as user-space BPF programs.
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