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[Testbed-admins] Queue size in Dummynet



Hello,

 

I was wondering whether any of you has already studied the behavior of Dummynet in terms of queue size. I have noticed that the queue has 50 slots in the pipe from the node to the network but 2 slots in the pipe from the network to the node, in case of a LAN. This seems to be a problem when configuring an experiment with a 100Mbps LAN where some nodes are connected at 10Mbps. Because of the 2 slots queue, there are many drops in traffic going to the 10Mbps nodes. Thus, the results are not realistic and I have to upgrade the queue size to a higher value.

 

Why is the default value for the queue 2 slots? Should I leave it like this or is there a better size in some cases?

 

Thank you and regards,

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Andrés