- Plugged into the Mac, the Frame is a USB network device ("Steam Frame",
usb0 at ~0.9 ms). The tunnel uses it when the Frame's usb0 answers,
with the usual host key; otherwise the normal path. Interleaved runs:
content p50 7 vs 10 ms, click to drawn 17 vs 27 ms, scroll p95 23 vs
31-37 ms. FRAME_MACVIEW_USB=0 turns it off; the card says "over USB-C".
- Bench: --usb, and the route is recorded per run.
- Docs: Steam's own streaming (no SteamVR host on macOS; Remote Play pairs
but streams games, not windows; test blocked); the Frame's USB network;
the 2026-09-28 health-check boot-loop recurrence.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
