[LARTC] Backlog with less rate than defined

[Luciano]

Hi all,

I setup a Linux machine to act as Lan Authentication server. So, the
same script that redirect the http connection to a login web page, it
create some queues to limit traffic, login by login. 

The PC uses only 1 ethernet interface that receive the packets source
routed to it and forward/nat to the external gateway using the same
interface.

For each login I create a queue like that:

tc class add dev '.$if_externa.' parent 1:1 classid 1:'.$filaDown.' htb
rate '.$banda_down.'kbit ceil 	'.$banda_down.'kbit prio 1'
tc filter add dev $if_externa protocol ip parent 1:0 prio 1 handle
::$filaDown u32 match ip dst $ipcliente/32 flowid 	1:$filaDown

My problem is that most of the queues created does NOT get full rate as
defined. I can see the packets entering backlog with much less rate than
defined, ex:

class htb 1:b1 parent 1:1 prio 1 rate 256Kbit ceil 256Kbit burst 1926b
cburst 1926b
 Sent 6644151 bytes 5435 pkts (dropped 0, overlimits 0)
 rate 669bps backlog 107p

Some help ?

Thanks in advance,

Luciano Lima