Re: [LARTC] Htb queueing problem

[Andy Furniss <andy.furniss@dsl.pipex.com>]

Diego Andrés Asenjo Gonzalez wrote:
> 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

As I select everything I don't know if this is enough - also I think you 
need to  select classify in netfilter the section.

> 
> 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)

It's nicer with htb to give interactive more bandwidth and higher prio 
than bulk. Also remember when setting rates that htb will see ip packets 
as ip length + 14 when used on ethX

  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.

You need an -o eth1 in the iptables rule for a proper count.

  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.

I am not sure what else is wrong I don't use classify, maybe check that 
there isn't any decimal/hex mismatch ie. try 0x44.

Andy.

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