HTB on loopback gives a bit rate multiplied by 8

Linux Advanced Routing and Traffic Control

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Hi,

I am trying to use htb to limit bandwidth on loopback for traffic
through particular port.

Here is the script I am using.

tc qdisc add dev lo root handle 1: htb
tc class add dev lo parent 1: classid 1:1 htb rate 100kbit ceil 100kbit
tc class add dev lo parent 1:1 classid 1:10 htb rate 50kbit ceil 50kbit
tc class add dev lo parent 1:1 classid 1:11 htb rate 50kbit ceil 50kbit
tc filter add dev lo protocol ip parent 1:0 prio 0 u32 match ip sport
22 0xffff flowid 1:10
tc filter add dev lo protocol ip parent 1:0 prio 0 u32 match ip dport
22 0xffff flowid 1:11

When this script is applied across eth0 (when I do a sftp to another
machine) the bandwidth limitation is applied correctly. However if I
use this in loopback (sftp to another directory in the same machine)
then I get bit rate approx 400kbit - i.e. usually it roughly
multiplies the bit rate by 8. Why does this happen? Does HTB work
differently in loopback? Any clue regarding this would be mostl
helpful.

Thanks
Kiruthika
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