[LARTC] Question about subclasses and filters

[Tilman Giese <tilman.giese@globalview.de>]

Hi,

unfortunately I did not get any response to my last message, so let me 
describe my problem in detail.

I am setting up a router that is responsible for four different offices 
like shown below:

                |--- Office 1 (192.168.100.242)
                |
   __________   |--- Office 2 (192.168.100.243)
---| Router |---|
   ----------   |--- Office 3 (192.168.100.244)
                |
                |--- Office 4 ------- 192.168.100.245
                                 |
                                 |--- 192.168.100.246
                                 |
                                 |--- 192.168.100.247

Each office should have one fourth of the available bandwidth, but can 
borrow bandwidth if necessary. 192.168.0.246 in Office 4 is something 
special. This server should have a maximum of one fourth.

Therefore I created the following classes:

# queuing discipline
tc qdisc add dev eth1 root handle 1: cbq bandwidth 2MBit allot 1514 cell 
8 avpkt 1000 mpu 64

# root class
tc class add dev eth1 parent 1:0 classid 1:1 cbq bandwidth 2MBit rate 
2MBit allot 1514 cell 8 weight 200KBit prio 5 maxburst 20 avpkt 1000

# offices
tc class add dev eth1 parent 1:1 classid 1:2 cbq bandwidth 2MBit rate 
512KBit allot 1514 cell 8 weight 50KBit prio 5 maxburst 20 avpkt 1000
tc class add dev eth1 parent 1:1 classid 1:3 cbq bandwidth 2MBit rate 
512KBit allot 1514 cell 8 weight 50KBit prio 5 maxburst 20 avpkt 1000
tc class add dev eth1 parent 1:1 classid 1:4 cbq bandwidth 2MBit rate 
512KBit allot 1514 cell 8 weight 50KBit prio 5 maxburst 20 avpkt 1000
tc class add dev eth1 parent 1:1 classid 1:5 cbq bandwidth 2MBit rate 
512KBit allot 1514 cell 8 weight 50KBit prio 5 maxburst 20 avpkt 1000

# Special treatment for 192.168.100.246
tc qdisc add dev eth1 parent 1:5 handle 2: cbq bandwidth 512KBit allot 
1514 cell 8 avpkt 1000 mpu 64
tc class add dev eth1 parent 2:0 classid 2:1 cbq bandwidth 512KBit rate 
512KBit allot 1514 cell 8 weight 50KBit prio 5 maxburst 20 avpkt 1000
tc class add dev eth1 parent 2:1 classid 2:2 cbq bandwidth 512KBit rate 
128KBit allot 1514 cell 8 weight 12KBit prio 5 maxburst 20 avpkt 1000

Then I added the following filters:

tc filter add dev eth1 parent 1:0 prio 5 protocol ip u32
tc filter add dev eth1 parent 1:0 prio 5 protocol ip u32 match ip dst 
192.168.100.242 flowid 1:2
tc filter add dev eth1 parent 1:0 prio 5 protocol ip u32 match ip dst 
192.168.100.243 flowid 1:3
tc filter add dev eth1 parent 1:0 prio 5 protocol ip u32 match ip dst 
192.168.100.244 flowid 1:4
tc filter add dev eth1 parent 1:0 prio 5 protocol ip u32 match ip dst 
192.168.100.245 flowid 1:5
tc filter add dev eth1 parent 1:0 prio 5 protocol ip u32 match ip dst 
192.168.100.247 flowid 1:5

# Special treatment for 192.168.100.246
tc filter add dev eth1 parent 2:0 prio 5 protocol ip u32
tc filter add dev eth1 parent 2:0 prio 5 protocol ip u32 match ip dst 
192.168.100.246 flowid 2:2

Everything okay up to here. But then I looked ar the following:

# tc -s class show dev eth1

class cbq 2: root rate 512Kbit (bounded,isolated) prio no-transmit
 Sent 261534164 bytes 433080 pkts (dropped 0, overlimits 0)
  borrowed 0 overactions 0 avgidle 12499 undertime 0
class cbq 2:1 parent 2: rate 512Kbit prio 5
 Sent 0 bytes 0 pkts (dropped 0, overlimits 0)
  borrowed 0 overactions 0 avgidle 12499 undertime 0
class cbq 2:2 parent 2:1 rate 128Kbit prio 5
 Sent 0 bytes 0 pkts (dropped 0, overlimits 0)
  borrowed 0 overactions 0 avgidle 1.13741e+06 undertime 0
class cbq 1: root rate 2Mbit (bounded,isolated) prio no-transmit
 Sent 142271650091 bytes 210353356 pkts (dropped 0, overlimits 0)
  borrowed 0 overactions 0 avgidle 3124 undertime 0
class cbq 1:1 parent 1: rate 2Mbit prio no-transmit
 Sent 2136522126 bytes 2961604 pkts (dropped 0, overlimits 0)
  borrowed 432995 overactions 0 avgidle 3124 undertime 0
class cbq 1:2 parent 1:1 rate 512Kbit prio 5
 Sent 6450824 bytes 12703 pkts (dropped 0, overlimits 0)
  borrowed 7022 overactions 0 avgidle 282608 undertime 0
class cbq 1:3 parent 1:1 rate 512Kbit prio 5
 Sent 1846942719 bytes 2448726 pkts (dropped 0, overlimits 0)
  borrowed 420044 overactions 0 avgidle 284352 undertime 0
class cbq 1:4 parent 1:1 rate 512Kbit prio 5
 Sent 21594419 bytes 67095 pkts (dropped 0, overlimits 0)
  borrowed 5312 overactions 0 avgidle 284352 undertime 0
class cbq 1:5 parent 1:1 leaf 2: rate 512Kbit prio 5
 Sent 261534164 bytes 433080 pkts (dropped 0, overlimits 0)
  borrowed 617 overactions 0 avgidle 284352 undertime 0

Now I have two questions.

1. Why is the package count of class 2:0 equal to the one of class 1:5?
2. Why are there no packets in class 2:2 and 2:1 respectively?

It would be nice if someone could help me or show me a place where I can 
find an answer to my questions.

Thanks in advance.

Tilman Giese

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