feat(sfu): profil de flux configurable (mesure la charge vidéo)#243
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SFU_BENCH_PAYLOAD / SFU_BENCH_PACKET_MS règlent la taille et la cadence des paquets (défaut audio Opus 80o/20ms). Ex partage d'écran ~2,2 Mbit/s : PAYLOAD=1100 PACKET_MS=4. On mesure le coût de FORWARDING, qui dépend du débit et du nombre de paquets, pas du codec (mediasoup relaie sans décoder). Mesuré (mode watch, 1 partageur vidéo, 1 cœur) : le CPU tient des milliers de spectateurs (2400 -> 0,74c/100%). Le vrai frein en vidéo = le réseau (in-process ici, donc calculé à part) : ~450 spectateurs sur 1 Gbit/s, ~4500 sur 10 Gbit/s. PACKET_MS/PAYLOAD passent de const à fn cachée (OnceLock), rtp_packet redimensionne la charge utile au profil.
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Ajoute
SFU_BENCH_PAYLOAD/SFU_BENCH_PACKET_MSpour simuler la charge d'un flux vidéo (défaut = audio Opus 80o/20ms). On mesure le coût de forwarding (fonction du débit/paquets, pas du codec).Mesuré (partage d'écran ~2,2 Mbit/s, mode watch, 1 cœur) : côté CPU un cœur forwarde à des milliers de spectateurs (2400 → 0,74c, 100%). Le frein réel en vidéo = le réseau (bench in-process, calculé à part) : ~450 spectateurs sur 1 Gbit/s, ~4500 sur 10 Gbit/s.
Crate hors-CI, clippy
-D warningsclean.