Re: [LARTC] ppp uplink shaping problems

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

Staenker wrote:
> Hello,
> 
> i played a few days with tc htb classes and classified my packets using
> iptables CLASSIFY target.
> 
> here is what i did:
> #!/bin/bash
> int='ppp0'
> #making all things clear
> tc qdisc del dev $int root
> iptables -t mangle --flush
> iptables -t mangle --delete-chain
> 
> if $1
> then
> #defining classes
> tc qdisc add dev $int root handle 1: htb default 20 r2q 2
> tc class add dev $int parent 1: classid 1:1 htb rate 22kbps
> 
> tc class add dev $int parent 1:1 classid 1:10 htb rate 10kbps ceil
> 22kbps prio 0
> tc class add dev $int parent 1:1 classid 1:20 htb rate 9kbps ceil 15kbps
> prio 1
> tc class add dev $int parent 1:1 classid 1:30 htb rate 3kbps ceil 13kbps
> prio 2
> tc qdisc add dev $int parent 1:10 handle 10: sfq perturb 10
> tc qdisc add dev $int parent 1:20 handle 20: sfq perturb 10
> tc qdisc add dev $int parent 1:30 handle 30: sfq perturb 10
> 
> iptables -t mangle -N TS_FWD
> iptables -t mangle -A FORWARD -j TS_FWD
> 
> iptables -t mangle -A TS_FWD -o ppp0 -p ! icmp --match length --length
> 0:70 -j CLASSIFY --set-class 1:10
> iptables -t mangle -A TS_FWD -o ppp0 -p ! icmp --match length --length
> 0:70 -j RETURN
> 
> iptables -t mangle -A TS_FWD -i eth2 -o ppp0 -p tcp --source 192.168.0.2
> --destination-port 80 -j CLASSIFY --set-class 1:20
> iptables -t mangle -A TS_FWD -i eth2 -o ppp0 -p tcp --source 192.168.0.2
> --destination-port 80 -j RETURN
> iptables -t mangle -A TS_FWD -i eth2 -o ppp0 -p tcp --source 192.168.0.2
> --destination-port 443 -j CLASSIFY --set-class 1:20
> iptables -t mangle -A TS_FWD -i eth2 -o ppp0 -p tcp --source 192.168.0.2
> --destination-port 443 -j RETURN
> 
> iptables -t mangle -A TS_FWD -i eth2 -o ppp0 -p tcp --source 192.168.0.2
> --destination-port 554 -j CLASSIFY --set-class 1:10
> iptables -t mangle -A TS_FWD -i eth2 -o ppp0 -p tcp --source 192.168.0.2
> --destination-port 554 -j RETURN
> #if $2
> #then
> #    iptables -t mangle -A TS_FWD -i eth2 -o ppp0 --source 192.168.0.2
> -j LOG
> #fi
> iptables -t mangle -A TS_FWD -i eth2 -o ppp0 --source 192.168.0.2 -j
> CLASSIFY --set-class 1:30
> fi
> 
> It works not really good. I tested it using my internal 100MBit network
> interface using multiple ftp connections and classified the packets
> based on their source-ip. That works fine with same classes. Immediately
> all things i expected took place. Also the prio option worked fine. If i
> was running 2 simultanious downloads, the one with the higher piority
> gets all borrowable downloadspeed and the one with the lower priority
> gets his ashured rate.
> But same classes didnt work with my 192kbit 2048kbit ppp link. Well ok,
> they are working, but not like i want them to work. The speed changes
> takes some seconds to take place. And the priority seems to be ignored.
> I have to say, that the i tested the ppp uplink using emule with many
> connections (500 - 800) and the higher priority upload was one active
> ftp connection.
> 
> Whats my fault?

I can't see what rule seperates ftp from the rest, so that could be it - 
check counters/classification with

tc -s class ls dev ppp0

If ftp is going to the right class then it may be that emule network 
traffic consists of loads of small packets. If your ppp0 is adsl then 
the difference between the ip length that htb sees and the actual length 
used on the wire can be significant enough to make you go over limits 
and end up with a 2+ second queue in your modem. Check with ping and 
make icmp go to top priority class. It is possible to patch tc/kernel to 
allow for this.

Andy.

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