Download ratio unstable

[magin@xxxxxxxxxxxxx]

Hi, i'm newbie with traffic control. I create a script based in one from
Jason Boxman (thx a lot). the upload flow is prioritized well, but when i
download from a site, the down flow vary a lot from 25 KB to 4 KB. Before
i use this script the downloads are constant between 22 an 25 KB. Perhaps
there's something wrong in my script ?
I paste it, thx.
---------------------------------------------------------------------

#!/bin/bash

RATE=100
LOCALIF=eth1

clear_all() {
        tc qdisc del dev $LOCALIF root >/dev/null 2>&1
        iptables -t mangle -F
}

create_tree() {
        tc qdisc add dev $LOCALIF root handle 1: htb default 1
        tc class add dev $LOCALIF parent 1: classid 1:1 htb rate
${RATE}kbit ceil ${RATE}kbit
        tc qdisc add dev $LOCALIF parent 1:1 handle 2: prio bands 4
        tc qdisc add dev $LOCALIF parent 2:1 handle 10: sfq perturb 20
        tc qdisc add dev $LOCALIF parent 2:2 handle 20: sfq perturb 20
        tc qdisc add dev $LOCALIF parent 2:3 handle 30: sfq perturb 20
        tc qdisc add dev $LOCALIF parent 2:4 handle 40: tbf rate
$(($RATE-40))kbit burst 1600 limit 3000
}

create_filters() {
        # Match SYN and RST packets
        iptables -t mangle -A POSTROUTING -o $LOCALIF -p tcp -m tcp
--tcp-flags ! SYN,RST,ACK ACK -j CLASSIFY --set-class 2:1

        # Match ACK packets
        iptables -t mangle -A POSTROUTING -o $LOCALIF -p tcp -m tcp
--tcp-flags SYN,RST,ACK ACK -m length --length :128 -m tos ! --tos
Normal-Service -j CLASSIFY --set-class 2:1

        # Match packets with TOS Minimize-Delay
        iptables -t mangle -A POSTROUTING -o $LOCALIF -p tcp -m tos --tos
Minimize-Delay -j CLASSIFY --set-class 2:2

        # ICMP
        iptables -t mangle -A POSTROUTING -o $LOCALIF -p icmp -j CLASSIFY
--set-class 2:1

        # HTTP
        iptables -t mangle -A POSTROUTING -o $LOCALIF -p tcp --dport 80 -j
CLASSIFY --set-class 2:2

        # IRC
        iptables -t mangle -A POSTROUTING -o $LOCALIF -p tcp --dport 6667
-j CLASSIFY --set-class 2:2

        # SSH
        iptables -t mangle -A POSTROUTING -o $LOCALIF -p tcp --dport 22 -j
CLASSIFY --set-class 2:2
        iptables -t mangle -A POSTROUTING -o $LOCALIF -p tcp --sport 22 -j
CLASSIFY --set-class 2:2

        iptables -t mangle -A POSTROUTING -p tcp -m tos --tos
Maximize-Throughput --sport ssh -j CLASSIFY --set-class 2:3
        iptables -t mangle -A POSTROUTING -p tcp -m tos --tos
Maximize-Throughput --dport ssh -j CLASSIFY --set-class 2:3

        # Matches for Edonkey and Overnet
        iptables -t mangle -A POSTROUTING -o $LOCALIF -p tcp --dport
4662:4672 -j CLASSIFY --set-class 2:4
        iptables -t mangle -A POSTROUTING -o $LOCALIF -p udp --dport
4662:4672 -j CLASSIFY --set-class 2:4
        iptables -t mangle -A POSTROUTING -o $LOCALIF -p tcp --sport
4662:4672 -j CLASSIFY --set-class 2:4
        iptables -t mangle -A POSTROUTING -o $LOCALIF -p tcp --sport
4662:4672 -j CLASSIFY --set-class 2:4

        # FTP
        iptables -t mangle -A POSTROUTING -o $LOCALIF -p tcp --dport 21 -j
CLASSIFY --set-class 2:3
        iptables -t mangle -A POSTROUTING -o $LOCALIF -p tcp --sport 21 -j
CLASSIFY --set-class 2:3
}

case $1 in
        'start')
                echo 'Creando la estructura qdisc ...'
                clear_all
                create_tree
                create_filters
                ;;
        'stop')
                echo 'Eliminando la estructura qdisc ...'
                clear_all
                ;;
esac

-------------------------------------------------------------------

That's all. Thanks in advance.

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