[LARTC] HTB statistics

["m.innocenti@cineca.it" <m.innocenti@cineca.it>]

Hi,
     there is something I'm not able to understand about HTB statistics.
Why the qdisc show show how many packets are overlimits but in the
classes there are always 0 packets overlimits or dropped?

I try to expain with a simple example. I create a qdisc htb with only a 
class and then i do a lot of traffic.
pc-innocenti:~# tc qdisc add dev eth0 parent root handle 1: htb default 10
pc-innocenti:~# tc class add dev eth0 parent 1:1 classid 1:10 htb rate
1kbit cei l 1kbit quantum 2000

The qdisc show that there are packets overlimits:
pc-innocenti:~# tc -s -d qdisc show
qdisc htb 1: dev eth0 r2q 10 default 10 direct_packets_stat 1145 ver 3.17
  Sent 339419 bytes 1533 pkts (dropped 0, overlimits 402)
  backlog 370p

The class instead always show 0 packet overlimits or dropped.
pc-innocenti:~# tc -s -d class show dev eth0
class htb 1:10 root prio 0 quantum 2000 rate 1000bit ceil 1000bit burst
1600b/8 mpu 0b overhead 0b cburst 1600b/8 mpu 0b overhead 0b level 0
  Sent 66307 bytes 480 pkts (dropped 0, overlimits 0)
  rate 912bit backlog 448p
  lended: 32 borrowed: 0 giants: 0
  tokens: -13238252 ctokens: -13238252


-- 
**********************************************************************
Marco Innocenti              Gruppo Infrastruttura e Sicurezza
CINECA                       phone:+39 0516171553 / fax:+39 0516132198
Via Magnanelli 6/3           e-mail: innocenti@cineca.it
40033 Casalecchio di Reno    Bologna (Italia)
**********************************************************************


-- 
**********************************************************************
Marco Innocenti              Gruppo Infrastruttura e Sicurezza
CINECA                       phone:+39 0516171553 / fax:+39 0516132198
Via Magnanelli 6/3           e-mail: innocenti@cineca.it
40033 Casalecchio di Reno    Bologna (Italia)
**********************************************************************
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