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> Alongside the eBPF program, we run a lightweight daemon — scaletozero-agent — that monitors those counters. If no new packets show up for a set period, it initiates the sleep process.

> No polling. No heuristics. Just fast, kernel-level idle detection.

Isn't the `scaletozero-agent` daemon effectively polling eBPF map counters...?

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markrwilliams|6 months ago

Nope! There are evented eBPF map types that userspace processes can watch with epoll(2), e.g. https://docs.ebpf.io/linux/map-type/BPF_MAP_TYPE_RINGBUF/#ep...