Move rate estimate from 64-bits to 32-bits, saving some bytes.

src/rust/lqos_bus/src/ip_stats.rs

@@ -149,7 +149,7 @@ pub struct FlowbeeData {
   /// Packets transmitted
   pub packets_sent: [u64; 2],
   /// Rate estimate
-  pub rate_estimate_bps: [u64; 2],
+  pub rate_estimate_bps: [u32; 2],
   /// TCP Retransmission count (also counts duplicates)
   pub tcp_retransmits: [u32; 2],
   /// Most recent RTT

src/rust/lqos_sys/src/bpf/common/flows.h

@@ -50,7 +50,7 @@ struct flow_data_t {
     // Bytes at the next rate estimate
     __u64 next_count_bytes[2];
     // Rate estimate
-    __u64 rate_estimate_bps[2];
+    __u32 rate_estimate_bps[2];
     // Sequence number of the last packet
     __u32 last_sequence[2];
     // Acknowledgement number of the last packet
@@ -292,8 +292,8 @@ static __always_inline void process_tcp(
 
             if (
                 tsecr == data->tsval[other_rate_index] &&
-                (data->rate_estimate_bps[rate_index] > HALF_MBPS_IN_BYTES_PER_SECOND ||
-                data->rate_estimate_bps[other_rate_index] > HALF_MBPS_IN_BYTES_PER_SECOND )
+                (data->rate_estimate_bps[rate_index] > 0 ||
+                data->rate_estimate_bps[other_rate_index] > 0 )
             ) {
                 __u64 elapsed = dissector->now - data->ts_change_time[other_rate_index];
                 if (elapsed < TWO_SECONDS_IN_NANOS) {

src/rust/lqos_sys/src/flowbee_data.rs

@@ -42,7 +42,7 @@ pub struct FlowbeeData {
   /// Bytes at the next rate estimate
   pub next_count_bytes: [u64; 2],
   /// Rate estimate
-  pub rate_estimate_bps: [u64; 2],
+  pub rate_estimate_bps: [u32; 2],
   /// Sequence number of the last packet
   pub last_sequence: [u32; 2],
   /// Acknowledgement number of the last packet