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

[gypsy <gypsy@iswest.com>]

Alvaro Motta wrote:
> 
> Hi Andy, thanks for your reply.
> 
> I don't see why the src should be the culprit, since the AB segment is
> 10.4 network and the BC is 192.168. And IMHO 0.0.0.0/0
> 
> Also, after modifying the src, the traffic rate was the same as if no
> qdisc were attached to the interface. I even played with the
> interfaces and the only way to throttle the traffic, is assigning the
> qdisc to the eth0 and having the src and dst as in the script I've
> sent.
> 
> AL

Al,

Somebody may have already helped you solve this; I have not read all
messages from LARTC yet.  If not:
Create 3 filters, each with the same (non zero) prio.  The first to
match 10.4.0.0/16, the second to match 192.168.0.0/24 and the last to
match 0.0.0.0/0 - then see where the packets go by running 
tc -s class ls dev eth0

32kbit = 32,000 bits per second.  32,000 / 8 bits per byte = 4,000 bytes
per second = 4Kbytes per second, and the reported flow rate should be
close to that for the packets that match the filter.
--
gypsy

> On 7/20/05, Andy Furniss <andy.furniss@dsl.pipex.com> wrote:
> > Alvaro Motta wrote:
> > > 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
> >
> > Should be src 192.168.0.0/24.
> >
> > Andy.
> >
> >
> > >
> > > 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
> > > _______________________________________________
> > > LARTC mailing list
> > > LARTC@mailman.ds9a.nl
> > > http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
> > >
> >
> >
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