[ns] When will Queue::deque() be called?

[Hei Xiaojun <sean@eea102.ee.ust.hk>]

Hi, ns users

If there are some packets in the queue, Queue::deque() will be called and
the HOL packet will be forwarded to the next hop. I record the calling
time in Queue::deque() by "Scheduler::instance().clock()". As expected, if
there are several packets in the buffer, the calling time of
Queue::deque() will differ by the packet transmission time consecutively.
However, if the HOL packet is dropped and NULL  pointer is return, the
simulator might think the queue is empty, the there are still some
packets in the buffer, it seems that the simulator needs 0.005 to detect
this. Is this number the accuracy of the simulator clock? If that is the
case, can I change this parameter?

Thanks

sean
--------------------------------------------------------
Hei Xiaojun						
Department of Electrical and Electronic Engineering	
Hongkong University of Science and Technology