Re: [LARTC] Question about subclasses and filters

[Stef Coene <stef.coene@docum.org>]

On Sunday 03 August 2003 09:46, Tilman Giese wrote:
> 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?
Because all packets entering class 1:5 are queued in the qdisc attached to 
that class.  And that qdisc is 2:0.

> 2. Why are there no packets in class 2:2 and 2:1 respectively?
You have a filter that puts packets from 2:0 to 2:2 if the dst address is 
X.X.X.246.  But you never put these packets in the 2:0 qdisc ...  So you have 
to add that filter to 1:0 and not to 2:0.

And some other remarks.  Bandwidth is the real NIC bandwidth.  So 10mbit or 
100mbit.  And you have to bound class 1:1 so the child classes can share the 
bandwidth. 
And why do you add the qdisc 2:0?  You can do this also with classes.  A cbq 
qdisc to a cbq class is never a good idea.

> It would be nice if someone could help me or show me a place where I can
> find an answer to my questions.
http://www.docum.org

Stef

-- 

stef.coene@docum.org
 "Using Linux as bandwidth manager"
     http://www.docum.org/
     #lartc @ irc.oftc.net

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