Question on Software and hardware queue

Hi All,
 
I am trying to understand the difference between the terms
software
queue
hardware queue
ingress queue
egress queue
 
So far my understanding
says:
* When no congestion, the packets are directly copied into the hardware
queue in a FIFO manner without taking it through the software queue. Only FIFO
is possible in hardware queue and there is only 1 hardware queue. (Is this
correct?)
* Software queue are defined as per the number of classes you define
manually. Are ingress queue and software queue one and the same?
* Each
physical port have a set of tx and rx queues depnding on the platform they
could be 2Q2T or 1P2Q2T. Are these ingress and egress queues?
* Is egress and
hardware queue one and the same? I think they are not then what is the
difference?
 
Can anyone help me to understand the clear distinction between
these terms or please share a link which can clearly show the queue
architecture?

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Received on Tue Jul 26 2011 - 11:34:18 ART