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The per-peer probe's cost was given as five syscalls read off the code rather than measured, and the backstop timer's as a few syscalls per period. Counted with strace on Linux, a probe that gets an answer makes five (socket, bind, connect, getsockname, close) and one with no route makes four. A build with debug assertions adds an fcntl before each close, from the standard library's open-descriptor check, which is why a test binary counts six. At the 128-peer default a sample is 640 syscalls, and a reported change under the default debounce costs two to nine samples, 1280 to 5760 syscalls. State those figures where the cost is described, and describe the backstop as costing one sample per period.
Reference
Information-oriented technical descriptions for lookup on demand. Reference content describes what is: wire formats, configuration keys, command-line flags, control-socket commands, default values, file paths, exit codes. It is consulted, not read end-to-end.
Reference is austere by design: minimal narrative, no opinions, no guidance on when to use a feature. The "why" lives in design/; the "how do I accomplish X" lives in how-to/.
Available Reference
| Document | Scope |
|---|---|
| wire-formats.md | All FMP and FSP message byte layouts, encapsulation walkthrough |
| configuration.md | Full YAML configuration reference for the daemon and gateway |
| security.md | nftables baseline, peer ACL, cryptographic primitives, rekey defaults, threat-resistance matrix |
| nostr-events.md | Kind 37195 advert, Kind 21059 traversal signaling, Kind 10050 inbox relays |
| transports.md | Per-transport statistics counter inventory |
| control-socket.md | Line-delimited JSON control protocol for the daemon and gateway |
| native-api.md | Native datagram API: the Rust surface, addressing and ports, errno table, ceilings, line protocol, command reference |
| cli-fips.md | fips daemon CLI: options, exit codes, environment, files |
| cli-fipsctl.md | fipsctl control-client: subcommands, options, exit codes |
| cli-fipstop.md | fipstop live-status TUI: tabs, keybindings |
| cli-fips-gateway.md | fips-gateway service CLI: options, exit codes, files |