[LARTC] Transfer rate above the desired (tc+htb)

[Alvaro Motta <alvarolmmotta@gmail.com>]

Hi folks.

I started to play with tc+htb last week, and I must confess that this
thing is really driving me nuts.

All we want to do is control bw, with no borrowing.

In order to get the feeling on this subject, I have setup the
following test bed.

---A---B---C---

On B: eth0 connecting A and eth1 connecting C.

The script.

tc qdisc del dev eth0 root
tc qdisc add dev eth0 root handle 1: htb default 50
tc class add dev eth0 parent 1: classid 1:1 htb rate 32kbit ceil 32kbit
tc filter add dev eth0 protocol ip parent 1:0 prio 100 u32 match ip
src 10.4.0.0/16 match ip dst 0.0.0.0/0 classid 1:1

If I try to transfer a 1M file from C to A:

[root@localpost tmp]# wget 192.168.0.23/1M
--09:22:32--  http://192.168.0.23/1M => `1M.8'
Connecting to 192.168.0.23:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1,024,000 [text/plain]
100%[===========>] 1,024,000    183.12K/s    ETA 00:00
09:22:38 (182.88 KB/s) - `1M' saved [1,024,000/1,024,000]

Wasn't it supposed to be around the 32KB/s?

If I play with the numbers (rateÎil) I get the following results:
128k => 404.78 KB/s
64k => 337.9 KB/s
16k => 68.86 KB/s
8k => 31.12 KB/s
1k => 3.77 KB/s

I even tried to set the rate to 1kbps in root, but also led to pretty
much the same results.

With no qdisc, the rate will go close to 1000 KB/s

B machine:
2.6.11-1.1369_FC4
iproute-2.6.11-1
TC HTB version 3.3

I have no clue on what I am doing wrong. Could anyone browse the above
script and give me hint?

Thanks in advance,

AL
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