lower SSU2 resend traffic spikes

libi2pd/SSU2.h

@@ -21,8 +21,8 @@ namespace transport
 {
 	const int SSU2_TERMINATION_CHECK_TIMEOUT = 25; // in seconds
 	const int SSU2_CLEANUP_INTERVAL = 72; // in seconds
-	const int SSU2_RESEND_CHECK_TIMEOUT = 400; // in milliseconds
-	const int SSU2_RESEND_CHECK_TIMEOUT_VARIANCE = 100; // in milliseconds
+	const int SSU2_RESEND_CHECK_TIMEOUT = 40; // in milliseconds
+	const int SSU2_RESEND_CHECK_TIMEOUT_VARIANCE = 10; // in milliseconds
 	const int SSU2_RESEND_CHECK_MORE_TIMEOUT = 10; // in milliseconds
 	const size_t SSU2_MAX_RESEND_PACKETS = 128; // packets to resend at the time
 	const uint64_t SSU2_SOCKET_MIN_BUFFER_SIZE = 128 * 1024;

libi2pd/SSU2Session.cpp

@@ -537,7 +537,7 @@ namespace transport
 		if (m_SentPackets.empty ()) return 0;
 		std::map<uint32_t, std::shared_ptr<SSU2SentPacket> > resentPackets;
 		for (auto it = m_SentPackets.begin (); it != m_SentPackets.end (); )
-			if (ts >= it->second->sendTime + it->second->numResends*m_RTO)
+			if (ts >= it->second->sendTime + (it->second->numResends + 1) * m_RTO)
 			{
 				if (it->second->numResends > SSU2_MAX_NUM_RESENDS)
 				{