[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.