[LARTC] [Help] IMQ download traffic is duplicated !?

["Yacine" <yacine@alyseo.com>]

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Hi,

I have a default class for my un-marked traffic (prio 5) and a prio 0 class for the important stuff,
but I do not understand why my download traffic is duplicated in both.

It work fine for my upload traffic (same setting except the red class but I have the same
result if I create an esfq instead).

Any comments/information will be appreciated.

Below my config :

tc commands from my scirpt :
# TC on my download link
tcdownload () {
        tc qdisc add dev $TC_D_INT root handle 1: htb default 99 debug $HTB_DEBUG
        tc class add dev $TC_D_INT parent 1: classid 1:1 htb rate ${D_LIMIT}kbit

        # VOIP class have the highest priority
        tc class add dev $TC_D_INT parent 1:1 classid 1:10 htb \
                rate ${VOIP}kbit ceil ${D_LIMIT}kbit prio 0
        tc qdisc add dev $TC_D_INT parent 1:10 handle 10: esfq perturb 10 hash dst limit 8
        tc filter add dev $TC_D_INT parent 1: prio 0 protocol ip handle 10 fw flowid 1:10

        # shape everything at $D_LIMIT minus $VOIP speed
        tc class add dev $TC_D_INT parent 1: classid 1:2 htb \
                rate $[$D_LIMIT-$VOIP]kbit ceil ${D_LIMIT}kbit

        # high prio class 1:20 to low prio class 1:99 (default)
        tc class add dev $TC_D_INT parent 1:2 classid 1:20 htb rate $[D_LIMIT-$VOIP]kbit prio 1
        tc class add dev $TC_D_INT parent 1:2 classid 1:99 htb rate $[D_LIMIT-$VOIP]kbit prio 5

        # all get Enchanced Stochastic Fairness (depending on dst ip), excet the default class (red):
        tc qdisc add dev $TC_D_INT parent 1:20 handle 20: esfq perturb 10 hash dst
        # Red setting /5 to make latency 200ms
        RED_MAX=$[($D_LIMIT*1000/8)/5]
        RED_MIN=$[$RED_MAX/3]
        RED_LIMIT=$[$RED_MAX*8]
        RED_AVPKT=1000
        tc qdisc add dev $TC_D_INT parent 1:99 handle 99: red bandwidth ${D_LIMIT} \
                probability 0.02 limit ${RED_LIMIT} min ${RED_MIN} max ${RED_MAX} \
                avpkt ${RED_AVPKT} burst $[((2*$RED_MIN)+($RED_MAX))/(3*$RED_AVPKT)] ecn

        # setup $IPTABLES hooks
        tc filter add dev $TC_D_INT parent 1: prio 1 protocol ip handle 20 fw flowid 1:20
        tc filter add dev $TC_D_INT parent 1: prio 5 protocol ip handle 99 fw flowid 1:99
}


#  tc -s -d class show dev imq1
class htb 1:99 parent 1:2 leaf 99: prio 5 quantum 1024 rate 80Kbit ceil 80Kbit burst 1701b/8 mpu 0b cburst 1701b/8 mpu 0b level 0
 Sent 114868 bytes 2209 pkts (dropped 0, overlimits 0)
 rate 2569bps 49pps
 lended: 2209 borrowed: 0 giants: 0
 tokens: 132320 ctokens: 132320

class htb 1:1 root rate 192Kbit ceil 192Kbit burst 1844b/8 mpu 0b cburst 1844b/8 mpu 0b level 7
 Sent 114857 bytes 2209 pkts (dropped 0, overlimits 0)
 rate 2658bps 51pps
 lended: 0 borrowed: 0 giants: 0
 tokens: 59900 ctokens: 59900

class htb 1:10 parent 1:1 leaf 10: prio 0 quantum 1433 rate 112Kbit ceil 192Kbit burst 1742b/8 mpu 0b cburst 1844b/8 mpu 0b level 0
 Sent 114857 bytes 2209 pkts (dropped 0, overlimits 0)
 rate 2658bps 51pps
 lended: 2209 borrowed: 0 giants: 0
 tokens: 96857 ctokens: 59900

class htb 1:2 root rate 80Kbit ceil 192Kbit burst 1701b/8 mpu 0b cburst 1844b/8 mpu 0b level 7
 Sent 115684 bytes 2218 pkts (dropped 0, overlimits 0)
 rate 2764bps 53pps
 lended: 0 borrowed: 0 giants: 0
 tokens: 132320 ctokens: 59900

class htb 1:20 parent 1:2 leaf 20: prio 1 quantum 1024 rate 80Kbit ceil 80Kbit burst 1701b/8 mpu 0b cburst 1701b/8 mpu 0b level 0
 Sent 816 bytes 9 pkts (dropped 0, overlimits 0)
 rate 20bps
 lended: 9 borrowed: 0 giants: 0
 tokens: 127200 ctokens: 127200


#  tc -s -d qdisc show dev imq1
qdisc red 99: limit 38400b min 1600b max 4800b ecn ewma 1 Plog 18 Scell_log 22
 Sent 3612535 bytes 68768 pkts (dropped 1, overlimits 1)
  marked 0 early 1 pdrop 0 other 0

 qdisc esfq 20: quantum 1000b limit 128p flows 128/1024 perturb 10sec hash: dst
 Sent 26055 bytes 300 pkts (dropped 0, overlimits 0)

 qdisc esfq 10: quantum 1000b limit 8p flows 128/1024 perturb 10sec hash: dst
 Sent 3569131 bytes 68642 pkts (dropped 0, overlimits 0)

 qdisc htb 1: r2q 10 default 99 direct_packets_stat 24 ver 3.16
 Sent 7209229 bytes 137739 pkts (dropped 1, overlimits 364)


#  iptables -t mangle -L
Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination
IMQ        all  --  anywhere             anywhere            IMQ: todev 1
pretos     all  --  anywhere             anywhere
tcpre      all  --  anywhere             anywhere

Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination
IMQ        all  --  anywhere             anywhere            IMQ: todev 0
tcfor      all  --  anywhere             anywhere

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination
outtos     all  --  anywhere             anywhere
tcout      all  --  anywhere             anywhere

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination

Chain outtos (1 references)
target     prot opt source               destination

Chain pretos (1 references)
target     prot opt source               destination

Chain tcfor (1 references)
target     prot opt source               destination
MARK       udp  --  anywhere             anywhere            udp dpts:8000:30000 MARK set 0xa
MARK       udp  --  anywhere             anywhere            udp dpts:5060:5069 MARK set 0xa
MARK       udp  --  anywhere             anywhere            udp dpts:2427:2436 MARK set 0xa
MARK       tcp  --  anywhere             anywhere            tcp dpt:ssh MARK set 0x14
MARK       tcp  --  anywhere             anywhere            tcp dpt:webmin MARK set 0x14
MARK       icmp --  anywhere             anywhere            MARK set 0x14
MARK       tcp  --  anywhere             anywhere            tcp flags:!SYN,RST,ACK/ACK MARK set 0x14
MARK       tcp  --  anywhere             anywhere            tcp flags:SYN,RST,ACK/ACK length 0:128 TOS match !Normal-Service MARK set 0x14
MARK       all  --  anywhere             anywhere            MARK match 0x0 MARK set 0x63

Chain tcout (1 references)
target     prot opt source               destination

Chain tcpre (1 references)
target     prot opt source               destination
MARK       udp  --  anywhere             anywhere            udp dpts:8000:30000 MARK set 0xa
MARK       udp  --  anywhere             anywhere            udp dpts:5060:5069 MARK set 0xa
MARK       udp  --  anywhere             anywhere            udp dpts:2427:2436 MARK set 0xa
MARK       tcp  --  anywhere             anywhere            tcp dpt:ssh MARK set 0x14
MARK       tcp  --  anywhere             anywhere            tcp dpt:webmin MARK set 0x14
MARK       icmp --  anywhere             anywhere            MARK set 0x14
MARK       tcp  --  anywhere             anywhere            tcp flags:!SYN,RST,ACK/ACK MARK set 0x14
MARK       tcp  --  anywhere             anywhere            tcp flags:SYN,RST,ACK/ACK length 0:64 TOS match !Normal-Service MARK set 0x14
MARK       all  --  anywhere             anywhere            MARK match 0x0 MARK set 0x63


#  tc -V
tc utility, iproute2-ss001007


#  uname -r
2.4.26


#  iptables --version
iptables v1.2.9


Thank you,
Yacine.

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