From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andy Furniss <andy.furniss@dsl.pipex.com>
Date: Wed, 20 Jul 2005 18:56:03 +0000
Subject: Re: [LARTC] Transfer rate above the desired (tc+htb)
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To: lartc@vger.kernel.org

Alvaro Motta wrote:
> Hi folks.
>=20
> I started to play with tc+htb last week, and I must confess that this
> thing is really driving me nuts.
>=20
> All we want to do is control bw, with no borrowing.
>=20
> In order to get the feeling on this subject, I have setup the
> following test bed.
>=20
> ---A---B---C---
>=20
> On B: eth0 connecting A and eth1 connecting C.
>=20
> The script.
>=20
> 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

Should be src 192.168.0.0/24.

Andy.


>=20
> If I try to transfer a 1M file from C to A:
>=20
> [root@localpost tmp]# wget 192.168.0.23/1M
> --09:22:32--  http://192.168.0.23/1M =3D> `1M.8'
> Connecting to 192.168.0.23:80... connected.
> HTTP request sent, awaiting response... 200 OK
> Length: 1,024,000 [text/plain]
> 100%[=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D>] 1,024,000    183.12K/s    ETA 00=
:00
> 09:22:38 (182.88 KB/s) - `1M' saved [1,024,000/1,024,000]
>=20
> Wasn't it supposed to be around the 32KB/s?
>=20
> If I play with the numbers (rate=CEil) I get the following results:
> 128k =3D> 404.78 KB/s
> 64k =3D> 337.9 KB/s
> 16k =3D> 68.86 KB/s
> 8k =3D> 31.12 KB/s
> 1k =3D> 3.77 KB/s
>=20
> I even tried to set the rate to 1kbps in root, but also led to pretty
> much the same results.
>=20
> With no qdisc, the rate will go close to 1000 KB/s
>=20
> B machine:
> 2.6.11-1.1369_FC4
> iproute-2.6.11-1
> TC HTB version 3.3
>=20
> I have no clue on what I am doing wrong. Could anyone browse the above
> script and give me hint?
>=20
> Thanks in advance,
>=20
> AL
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> LARTC@mailman.ds9a.nl
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>=20

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