[LARTC] CBQ : Bug ?

[LARTC] CBQ : Bug ?

[Stef Coene]

Hi there,

I have done a lot of testing and I have a few questions about CBQ.  You
can split the traffic in diffent classes and it works great.  But to do
this, I have to add as the first class a bounded class with rate available link-bandwidth.
I have tried different rates but CBQ isn't very accurate.  I added the
testing results at the bottom of the posting (or go to
http://users.belgacom.net/staf/)  As you can see there are some very
strange results (notice the change in throughput when I changed the rate
1kbps around 71475kbps and 135556kbps).

I also noticed that the accuracy of splitting the traffic in different
classes is very good unless you want to give a class < 25% of the
bandwidth.

I'm wondering if someone encountered the same problem and/or if it is a
problem with tc or the kernel itself.

-- 

Staf

More QOS info : http://users.belgacom.net/staf/


RESULTS :
RATE_TOT    RESULT
1     kbps  1.05 KB/s
2     kbps  2.10 KB/s
3     kbps  3.04 KB/s
4     kbps  4.17 KB/s
5     kbps  5.02 KB/s
10    kbps  9.91 KB/s
15    kbps  14.7 KB/s
20    kbps  18.8 KB/s
30    kbps  29.2 KB/s
40    kbps  36.5 KB/s
50    kbps  49.2 KB/s
60    kbps  49.4 KB/s
65    kbps  49.3 KB/s
67    kbps  49.3 KB/s
68    kbps  49.3 KB/s
69    kbps  49.3 KB/s
71475  bps  51.1 KB/s
71476  bps  69.7 KB/s
70    kbps  69.9 KB/s
80    kbps  69.9 KB/s
90    kbps  70.3 KB/s
100   kbps  75.4 KB/s
130   kbps  75.7 KB/s
135556 bps  78.7 KB/s
135557 bps  139  KB/s
140   kbps  140  KB/s
150   kbps  140  KB/s
200   kbps  140  KB/s
300   kbps  140  KB/s
500   kbps  140  KB/s
1000  kbps  140  KB/s
1310719bps  146  KB/s
1310720bps  940  KB/s
2000  kbps  945  KB/s

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