Hi,
I am new to the
mailing list so I'm not sure if anybody reads these, but here goes nothing. I
recently read: Linux Advanced Routing & Traffic Control HOWTO
and have been trying to test my applications using bandwidth
limitation. All the examples described in the HOWTO do not simulate the
conditions I need to test my software. What I would like is for my bandwidth
limitation to empty my UDP buffer at a given rate. I have tried using a simple
TBF to do this, but all that happens is that my application floods the TBF
buffer at link speed and the TBF buffer quickly overflows and drops packets. I
want the packets to actually stay in the UDP buffer and be emptied at a given
rate without modifying my application.
I don't know if any
of you are familiar with netem, but it can be used in conjuction with tc to add
delay to a link. Surprisingly, packets delayed by netem appear to remain in the
UDP buffer until it is time for them to be sent. I would like this same behavior
of keeping the packets in the UDP buffer, but with bandwidth limitation on the
rate at which the buffer empties, not just packet delay. Has anybody ever done
anything like this or can point me to some resources?
Thank
you,
Ted
P.
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