[LARTC] htb limiting trouble: no overlimit or dropped packets

[Walter Haidinger <walter.haidinger@gmx.at>]

Hi!

I'm trying to limit the uplink bandwidth using htb but no packets are
overlimit or dropped. :-(

My router config:
* Linux kernel 2.4.20-pre10 (htb v3.7) with everything built as
  modules in QoS, iptables in use.
* tc binary from htb3.6-020525.tgz
* external interface eth0: Internet access, 512 kbit/s uplink speed
* internal interface eth1: internal LAN, 100 Mbit/s

The hosts in the internal lan should be bandwidth limited and are
masqueraded by the router.

Q: Must the versions of the kernel module and the tc utility match?

Below are my commands to create the qdiscs and classes:

tc qdisc add dev eth1 root handle 1: htb default 20
tc class add dev eth1 parent 1:  classid 1:1  htb rate 64kbit ceil 64kbit burst 5k
tc class add dev eth1 parent 1:1 classid 1:10 htb rate 64kbit ceil 64kbit burst 5k
tc class add dev eth1 parent 1:1 classid 1:20 htb rate 57kbit ceil 64kbit burst 5k
tc class add dev eth1 parent 1:1 classid 1:30 htb rate 51kbit ceil 64kbit burst 5k
tc class add dev eth1 parent 1:1 classid 1:40 htb rate 6kbit burst 0
tc qdisc add dev eth1 parent 1:10 handle 10: sfq perturb 10
tc qdisc add dev eth1 parent 1:20 handle 20: sfq perturb 10
tc qdisc add dev eth1 parent 1:30 handle 30: sfq perturb 10
tc qdisc add dev eth1 parent 1:40 handle 40: sfq perturb 10

Notes:
* No errors from the tc utility
* All filters are scrapped for testing purposes, leaving only
  unclassified packets which go the default class (this works)
* Bandwidths are really low for testing
* There are four classes with 100%, 90%, 80% and 10% bandwidth

Next I tried an FTP upload from a machine on the internal LAN to the
internet, creating the following qdisc and class statistics:

qdisc sfq 40: quantum 1514b perturb 10sec
 Sent 0 bytes 0 pkts (dropped 0, overlimits 0)

 qdisc sfq 30: quantum 1514b perturb 10sec
 Sent 0 bytes 0 pkts (dropped 0, overlimits 0)

 qdisc sfq 20: quantum 1514b perturb 10sec
 Sent 13408020 bytes 12433 pkts (dropped 0, overlimits 0)

 qdisc sfq 10: quantum 1514b perturb 10sec
 Sent 0 bytes 0 pkts (dropped 0, overlimits 0)

 qdisc htb 1: r2q 10 default 20 direct_packets_stat 0
 Sent 13408020 bytes 12433 pkts (dropped 0, overlimits 13422)

 class htb 1:1 root rate 64Kbit ceil 64Kbit burst 1023b cburst 1680b
 Sent 13408020 bytes 12433 pkts (dropped 0, overlimits 0)
 rate 35bps
 lended: 1136 borrowed: 0 giants: 0
 tokens: 51202 ctokens: 116901

class htb 1:10 parent 1:1 leaf 10: prio 0 rate 64Kbit ceil 64Kbit burst
1023b cburst 1680b
 Sent 0 bytes 0 pkts (dropped 0, overlimits 0)
 lended: 0 borrowed: 0 giants: 0
 tokens: 102400 ctokens: 168099

class htb 1:20 parent 1:1 leaf 20: prio 0 rate 57Kbit ceil 64Kbit burst
1671b cburst 1680b
 Sent 13408020 bytes 12433 pkts (dropped 0, overlimits 0)
 rate 35bps
 lended: 11297 borrowed: 1136 giants: 0
 tokens: 130246 ctokens: 116901

class htb 1:30 parent 1:1 leaf 30: prio 0 rate 51Kbit ceil 64Kbit burst
1664b cburst 1680b
 Sent 0 bytes 0 pkts (dropped 0, overlimits 0)
 lended: 0 borrowed: 0 giants: 0
 tokens: 208941 ctokens: 168099

class htb 1:40 parent 1:1 leaf 40: prio 0 rate 6Kbit ceil 6Kbit burst
1606b cburst 1606b
 Sent 0 bytes 0 pkts (dropped 0, overlimits 0)
 lended: 0 borrowed: 0 giants: 0
 tokens: 1714132 ctokens: 1714132

Well, everything goes to the default class 1:20 which is OK.
However, the traffic is *not* limited! No packets overlimit or dropped!
The FTP upload succeeded with full uplink speed (512 kbit/s).

Q: What am I missing here? Why isn't the traffic limited by HTB?

I've read the LARTC Howto, the required manpages, the docs at Martin
Devera's Homepage and had a look at the Wondershaper. Unfortunately I'm
still unable to find the bug. :-( Any hints would be appreciated!

Thanks, Walter

PS: I've also tried using filters u32 and fwmark but traffic was
    never limited. I guess there is something wrong with my
    class/qdisc setup in general, right?



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