Add histogram names

packet-exchange/src/client.c

@@ -390,7 +390,7 @@ static void print_histograms() {
     max_hist_val = histogram_max(histogram, MAX_RTT - 1);
   }
 
-  printf("# Histogram\n");
+  printf("# Packet TX timestamps histogram\n");
 
   for (int j = 0; j < max_hist_val; j++)
     printf("%06d %015" PRIi64 "\n", j, histogram[j]);

packet-exchange/src/server.c

@@ -374,7 +374,7 @@ static void print_histograms() {
   if (enable_timestamps) {
     max_latency = histogram_max(kernel_latency_hist, MAX_KERNEL_LATENCY - 1);
 
-    printf("# Histogram\n");
+    printf("# Packet RX timestamps histogram\n");
 
     for (int j = 0; j < max_latency; j++)
       printf(" %06d %015" PRIi64 "\n", j, kernel_latency_hist[j]);
@@ -386,7 +386,7 @@ static void print_histograms() {
 
   }
 
-  printf("# Histogram\n");
+  printf("# Packet jitter histogram\n");
 
   for (int j = min_jitter; j < max_jitter; j++)
     printf(" %06d %015" PRIi64 "\n", j, jitter_hist[j]);