[LARTC] unexpected drop

[LARTC] unexpected drop

[Roberto Belletti]

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Hello everybody, 

I have a Linux router with an ethernet adapter and a ADSL device.
My router has a GRE tunnel connected to a remote IP address.

Using "tc" I have configured 3 different classes:
1. 290kbit rate (used for Voip Services)
2. 180kbit rate (used for GRE tunnel)
3. 80kbit rate (for generic data traffic)

For each class, using "iperf", I send some data from a PC (connected attraverso eth0 device)
to a remote destination. The remote destination is the GRE tunnel terminator.

The data traffic test is different for each class:
1. 240kbit, 60byte packet size, UDP protocol
2. 200kbit, 250byte packet size, UDP protocol
3. 80kbit, 235byte packet size, UDP protocol

In this way I got a lot of dropped packets on each class, while my expected results was
a many drop packages only on the second class.

Can someone help me?
Thank all you,
roberto

This is the class configuration script:
iptables -t mangle -A PREROUTING -m dscp --dscp 40  -j MARK --set-mark 100
iptables -t mangle -A PREROUTING -m dscp --dscp 40  -j ACCEPT
iptables -t mangle -A PREROUTING -d 11.11.11.250  -j DSCP --set-dscp 16
iptables -t mangle -A PREROUTING -d 11.11.11.250  -j MARK --set-mark 200
iptables -t mangle -A PREROUTING -d 11.11.11.250  -j ACCEPT
iptables -t mangle -A PREROUTING -j DSCP --set-dscp 0
iptables -t mangle -A PREROUTING -j MARK --set-mark 300
iptables -t mangle -A PREROUTING -j ACCEPT

tc qdisc add dev atm0 root handle 1: cbq bandwidth 500Kbit avpkt 500
tc qdisc add dev tadsl0 root handle 1: cbq bandwidth 500Kbit avpkt 500

tc class add dev atm0 classid 1:1 parent 1: cbq bandwidth 500Kbit rate 500Kbit avpkt 400 prio 1 allot 500

tc class add dev atm0 classid 1:2 parent 1:1 cbq bandwidth 500Kbit rate 290Kbit avpkt 400 prio 1 allot 500 bounded isolated
tc filter add dev atm0 parent 1:0 protocol ip prio 1 handle 100 fw flowid 1:2
tc qdisc add dev atm0 parent 1:2 pfifo limit 10

tc class add dev atm0 classid 1:3 parent 1:1 cbq bandwidth 500Kbit rate 180Kbit avpkt 400 prio 2 bounded isolated allot 500
tc filter add dev atm0 parent 1:0 protocol ip prio 2 handle 200 fw flowid 1:3
tc qdisc add dev atm0 parent 1:3 handle 20: sfq perturb 5

tc class add dev atm0 classid 1:4 parent 1:1 cbq bandwidth 500Kbit rate 80Kbit avpkt 400 prio 3 bounded isolated allot 500
tc filter add dev atm0 parent 1:0 protocol ip prio 3 handle 300 fw flowid 1:4
tc qdisc add dev atm0 parent 1:4 handle 30: sfq perturb 5

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Re: [LARTC] unexpected drop

[Andy Furniss]

Roberto Belletti wrote:
> Hello everybody, 
> 
> I have a Linux router with an ethernet adapter and a ADSL device.
> My router has a GRE tunnel connected to a remote IP address.
> 
> Using "tc" I have configured 3 different classes:
> 1. 290kbit rate (used for Voip Services)
> 2. 180kbit rate (used for GRE tunnel)
> 3. 80kbit rate (for generic data traffic)
> 
> For each class, using "iperf", I send some data from a PC (connected attraverso eth0 device)
> to a remote destination. The remote destination is the GRE tunnel terminator.
> 
> The data traffic test is different for each class:
> 1. 240kbit, 60byte packet size, UDP protocol
> 2. 200kbit, 250byte packet size, UDP protocol
> 3. 80kbit, 235byte packet size, UDP protocol
> 
> In this way I got a lot of dropped packets on each class, while my expected results was
> a many drop packages only on the second class.

iperf may be using data rates htb uses ip level packet sizes (I guess on 
atm0 - it's ip len +14 on eth).

I don't know cbq but notice the rates don't add up.

Andy.
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