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?
Overlimits is more a kernel thing then usefull as a traffic control figure and tc qdisc -s .. shows the root 1: htb but tc -s class doesn't.
You can see drops with tc -s class - but the default htb queue is too long in this test. Add a specific queue to the class 1:10 so you can specify length. eg.
tc qdisc add dev eth0 parent 1:10 handle 10: bfifo limit 64k
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
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