Ranjit Manomohan wrote:

Currently the HTB rate for a class is update very slowly (once
every 16 seconds). This patch updates the rate whenever the stats
are requested from user space. This enables more accurate rate
monitoring.

+/* Update packet/byte rate for a class. */
+static void calc_rate(struct htb_class *cl)
+{
+    unsigned long now = jiffies;
+    if (time_after(now, (cl->rate_est_when + HZ))) {
+    unsigned int elapsed_secs =
+            (now - cl->rate_est_when)/HZ;
+        cl->sum_bytes /= elapsed_secs;
+        cl->sum_packets /= elapsed_secs;
+        RT_GEN (cl->sum_bytes,cl->rate_bytes);
+        RT_GEN (cl->sum_packets,cl->rate_packets);
+        cl->rate_est_when = now;
+    } else if time_before(now, cl->rate_est_when)
+        cl->rate_est_when = now; /* Wraparound */
+}

We have a generic rate estimator, I think we should convert HTB over
to use it and then maybe add this feature to the generic estimator.