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List:       lartc
Subject:    [LARTC] Htb queueing problem
From:       Diego_Andrés_Asenjo_Gonzalez <dasenjo () gmail ! com>
Date:       2006-02-28 11:56:53
Message-ID: 44043A85.6080302 () gmail ! com
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Hi everybody!

I'm using an edge bridge box with two ethernet cards to shape traffic in 
  a WAN link. I'm running Debian 3.1 stable with kernel 2.6.8 and 
iproute from packages. I recompiled the kernel with the following 
built-in options:

[*] 802.1d Ethernet Bridging

[*] QoS and/or fair queueing
<*>   HTB packet scheduler
<*>   SFQ queue

[*]   QoS support
<*> Firewall based classifier
<*> U32 classifier

I can mark packages with iptables, but I _can't_ make the packages get 
queued in an specific class. Please, take a look on this sample script 
that guarantees 64kbit (rate), 72kbit (ceil) to the packets coming from 
the host 172.16.0.185 to the 172.16.1.0/24 network with 10000-10100 
destination ports:

# Flush tc qdiscs:
/sbin/tc qdisc del dev eth0 root >/dev/null 2>&1
/sbin/tc qdisc del dev eth1 root >/dev/null 2>&1

# Create root qdiscs:
/sbin/tc qdisc add dev eth0 root handle 1: htb default 1000
/sbin/tc qdisc add dev eth1 root handle 2: htb default 1000

# Create root class (1:1 2:1) :
/sbin/tc class add dev eth0 parent 1: classid 1:1 htb rate 3456kbit ceil 
3456kbit burst 0 prio 1
/sbin/tc class add dev eth1 parent 2: classid 2:1 htb rate 3584kbit ceil 
3584kbit burst 0 prio 1

# Create default class (1:1000 2:1000) :
/sbin/tc class add dev eth0 parent 1:1 classid 1:1000 htb rate 3350kbit 
ceil 3500kbit burst 0 prio 5
/sbin/tc class add dev eth1 parent 2:1 classid 2:1000 htb rate 3350kbit 
ceil 3500kbit burst 0 prio 5

# Create classes (1:44 2:44) :
/sbin/tc class add dev eth0 parent 1:1 classid 1:44 htb rate 64kbit ceil 
72kbit burst 8kbit prio 1 quantum 1536
/sbin/tc class add dev eth1 parent 2:1 classid 2:44 htb rate 64kbit ceil 
72kbit burst 8kbit prio 1 quantum 1536

# Flushing iptables rules:
/sbin/iptables -F -t mangle

# iptables classify
/sbin/iptables -A POSTROUTING -t mangle -p udp -s 172.16.0.185/32 
--sport  10000:10100 -d 172.16.1.0/24  -j CLASSIFY --set-class 2:44

Now the statistics:

bridge:~# iptables -L -t mangle -v
34302 2415K CLASSIFY   udp  --  any    any     172.16.0.185 
172.16.1.0/24       udp spts:10000:10100 CLASSIFY set 2:44

bridge:~# tc -s cl sh dev eth1
class htb 2:44 parent 2:1 prio 1 rate 64000bit ceil 72000bit burst 1023b 
cburst 1608b
  Sent 0 bytes 0 pkts (dropped 0, overlimits 0)
  lended: 0 borrowed: 0 giants: 0
  tokens: 131070 ctokens: 183067

class htb 2:1 root rate 3584Kbit ceil 3584Kbit burst 2Kb cburst 2Kb
  Sent 4686617538 bytes 6922322 pkts (dropped 0, overlimits 0)
  rate 1936bit 2pps
  lended: 3691 borrowed: 0 giants: 0
  tokens: 4461 ctokens: 4461

class htb 2:1000 parent 2:1 prio 5 rate 3350Kbit ceil 3500Kbit burst 
2017b cburst 2Kb
  Sent 4686617538 bytes 6922322 pkts (dropped 0, overlimits 0)
  rate 1936bit 2pps
  lended: 6918631 borrowed: 3691 giants: 0
  tokens: 4700 ctokens: 4543

As you can see, the packets are mraked by iptables but get queued 
through the default class. I'm getting frustated and I will appreciate 
all suggestions and comments.

I'm using now -j CLASSIFY but I have used -j MARK and u32 tc filters 
with the same results.

Thanks a lot for reading.

Bye.
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