[LARTC] HTB - ethloop - overlimits?

[Oswin Budiman <armahalma@gmail.com>]

Hi all,

I'm trying to setup htb on a box with the following class configuration:

class htb 1:2 root rate 4Mbit ceil 4Mbit burst 2099b/8 mpu 0b overhead
0b cburst 2099b/8 mpu 0b overhead 0b level 7
 Sent 0 bytes 0 pkts (dropped 0, overlimits 0 requeues 0) 
 lended: 0 borrowed: 0 giants: 0
 tokens: 4300 ctokens: 4300

class htb 1:4 parent 1:2 leaf 4: prio 7 quantum 1000 rate 1Kbit ceil
1Kbit burst 1599b/8 mpu 0b overhead 0b cburst 1599b/8 mpu 0b overhead
0b level 0
 Sent 0 bytes 0 pkts (dropped 0, overlimits 0 requeues 0) 
 lended: 0 borrowed: 0 giants: 0
 tokens: 13107200 ctokens: 13107200

class htb 1:6 parent 1:2 leaf 6: prio 0 quantum 12500 rate 1Mbit ceil
1Mbit burst 1724b/8 mpu 0b overhead 0b cburst 1724b/8 mpu 0b overhead
0b level 0
 Sent 0 bytes 0 pkts (dropped 0, overlimits 0 requeues 0) 
 lended: 0 borrowed: 0 giants: 0
 tokens: 14131 ctokens: 14131

class htb 1:7 parent 1:2 leaf 7: prio 0 quantum 37500 rate 3Mbit ceil
3Mbit burst 1974b/8 mpu 0b overhead 0b cburst 1974b/8 mpu 0b overhead
0b level 0
 Sent 0 bytes 0 pkts (dropped 0, overlimits 0 requeues 0) 
 lended: 0 borrowed: 0 giants: 0
 tokens: 5392 ctokens: 5392

and then I try to simulate the traffic using ethloop to see it it's work.
I use the following script to generate the packet on ethloop. I'm
using loopback interface.

# Set interface
0       i       0       lo
0       i       1       lo
# Set packet size
0       S       0       1k
0       S       1       1k
# Determine flow id
0       P       0       0x10006
0       P       1       0x10007
# Start flow...
0       R       0       4000k
0       R       1       4000k
# Finish it. 
10000   X       0       0  

Foxtrot ethloop # ethloop < input > output

When it finish, I got weird output. When I see the tc stat, the flow
enters the right class but the rate is terribly wrong... I wonder what
happen to it? Here's the output file and tc stat.

Foxtrot ethloop # cat output

0.5 173183 98004 443 0 55401 57802 3 0
1.0 136001 118161 734 0 13147 13717 3 0
1.5 128969 124736 735 0 3120 3255 3 0
2.0 125141 124136 735 0 740 772 3 0
2.5 125825 125586 735 0 176 183 3 0
3.0 124266 129381 735 0 42 44 3 0
3.5 125977 125555 736 0 10 10 3 0
4.0 129326 127894 735 0 2 3 3 0
4.5 125209 124869 737 0 1 1 3 0
5.0 124410 129449 128 0 0 0 3 0
5.5 125842 125418 417 0 0 0 3 0
6.0 128815 128714 706 0 0 0 3 0
6.5 125021 124997 736 0 0 0 3 0
7.0 127941 127936 735 0 0 0 3 0
7.5 124749 124748 736 0 0 0 3 0
8.0 128248 127326 735 0 1113 1113 2 0
8.5 125319 125100 735 0 264 264 2 0
9.0 127961 126230 735 0 63 63 2 0
9.5 124722 124311 735 0 15 15 2 0
10.0 127203 127105 736 0 4 4 2 0

Foxtrot ethloop # qd lo

qdisc htb 1: r2q 10 default 4 direct_packets_stat 0 ver 3.17
 Sent 2728960 bytes 2665 pkts (dropped 0, overlimits 3996 requeues 0) 
qdisc sfq 4: parent 1:4 limit 128p quantum 16450b flows 128/1024 perturb 10sec 
 Sent 0 bytes 0 pkts (dropped 0, overlimits 0 requeues 0) 
qdisc sfq 6: parent 1:6 limit 128p quantum 16450b flows 128/1024 perturb 10sec 
 Sent 2297856 bytes 2244 pkts (dropped 0, overlimits 0 requeues 0) 
qdisc sfq 7: parent 1:7 limit 128p quantum 16450b flows 128/1024 perturb 10sec 
 Sent 431104 bytes 421 pkts (dropped 0, overlimits 0 requeues 0)
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