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reactive backoff tuning

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liquidraver
2026-03-15 21:14:21 +01:00
parent 3bec5fedb9
commit 4ad8b13756
5 changed files with 57 additions and 18 deletions
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zephcore/src/Mesh.cpp
+7 -9
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@@ -47,15 +47,13 @@ void Mesh::extendPendingRetransmit(uint32_t hash32)
if (pkt && pkt->isRouteFlood()
&& ContentionTracker::computePacketHash32(pkt) == hash32) {
uint32_t airtime = _radio->getEstAirtimeFor(pkt->getRawLength());
uint16_t headroom = _contention.getReactiveHeadroom(hash32, airtime);
if (headroom == 0) break;
uint32_t extra = _rng->nextInt(0, (int)headroom + 1);
/* Reschedule from NOW, not from the original EMA-based schedule.
* Hearing a dupe means the channel was just used — defer from
* this moment, don't compound on top of the base delay. */
_mgr->rescheduleOutbound(i, now + extra);
_contention.addReactiveExtension(hash32, (uint16_t)extra);
notifyTxQueued(extra);
uint16_t delay = _contention.getReactiveHeadroom(hash32, airtime);
if (delay == 0) break;
/* Reschedule from NOW: heard a dupe, defer by one
* backoff_multiplier × airtime window per dupe. */
_mgr->rescheduleOutbound(i, now + delay);
_contention.addReactiveExtension(hash32, delay);
notifyTxQueued(delay);
break;
}
}