Changli Gao wrote:

This patch make HTB update class's bstats in one place when dequeuing
packets instead of updating the leaf's when enqueuing and updating the
other's when dequeuing. It also fixes a statistics bug, the statistics
data of leaf class will exceeds its parent classes's due to packets are
dropped by its inner qdisc.

They should actually all be updated in enqueue. The estimators needs
this since they're estimating the arrival rate.