additional time slicing for flow

solanaceae/ngc_ft1/cubic.cpp

@@ -102,6 +102,8 @@ int64_t CUBIC::canSend(float time_delta) {
 	// this is mostly to prevent spikes on empty windows
 	const auto rate = window / getCurrentDelay();
 
+	// TODO: time slicing alla flow
+
 	// we dont want this limit to fall below atleast 1 segment
 	const int64_t max_bytes_per_tick = std::max<int64_t>(rate * time_delta + 0.5f, MAXIMUM_SEGMENT_SIZE);
 	cspace_bytes = std::min<int64_t>(cspace_bytes, max_bytes_per_tick);

solanaceae/ngc_ft1/flow_only.cpp

@@ -80,7 +80,15 @@ int64_t FlowOnly::canSend(float time_delta) {
 
 	// also limit to max sendrate per tick, which is usually smaller than window
 	// this is mostly to prevent spikes on empty windows
-	fspace = std::min<int64_t>(fspace, max_byterate_allowed * time_delta + 0.5f);
+	fspace = std::min<int64_t>({
+		fspace,
+
+		// slice window into time time_delta sized chunks and only allow 1.5 chunks sized per tick
+		int64_t((1.5f * _fwnd) / time_delta + 0.5f),
+
+		// similar, but without current delay in the equation (fallback)
+		int64_t(1.2f * max_byterate_allowed * time_delta + 0.5f),
+	});
 
 	// limit to whole packets
 	return (fspace / MAXIMUM_SEGMENT_DATA_SIZE) * MAXIMUM_SEGMENT_DATA_SIZE;