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e0329ceee6
Without one every c7200 busy-waits a full CPU core for the whole scenario -- the tests create raw nodes and no template supplies a value (measured: constant ~100 % per router, up to ~6 minutes per dynamips scenario). harness.dynamips_idlepc() detects a value through the controller's auto_idlepc endpoint (the GUI idle-PC finder path: a throwaway project boots the image, candidate values are validated by measuring actual CPU usage) and caches it in ~/.cache/gns3-e2e/idlepc.json keyed by the image checksum, so the cost (~100 s here) is paid once per image, not per run. GNS3_E2E_IDLEPC overrides detection; any failure returns None and the scenarios run without one rather than fail on a CPU optimisation. All four scenarios that boot c7200 routers (dynamips kernel/relay, ethernet switch kernel/relay) pass the value at creation. Live: detected 0x60189234 for the M11 image (238 s first run including detection); the routers drop from ~100 % during boot to 3-8 % steady (sampled per process), and a re-run reports the cached value with no detection.