imprecision in bandwidth measurement

Linux Advanced Routing and Traffic Control

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Hi,

I am experiencing a curious phenomenon. I limited the bandwidth for a specific client to 750KBit. It works well despite of the fact that the client always gets a little bit more bandwidth (around 770KBit to 780KBit). I used different bandwidth and traffic measurement tools like ntop, nettimer or ipac. All show the same, a little bit more bandwidth than allowed. The factor by which the specified bandwidth is increased seems to be proportional to the specified bandwidth. But where is the problem. Is it only a different way of traffic measurement or is this a bug? Maybe, does it depend on some command arguments to create the classes?

Tilman

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