[c-nsp] Shaping vs. queuing

[David Curran]

I understand at a common sense level how shaping and queuing are different
from each other and how they affect discreet packets or flows.  What I¹m
trying to understand  is in the context of different types of traffic which
is best?  Some things I ³know² about the situation are:

* TCP has a congestion control mechanism in windowing and slow-start and can
react to tail-drop or drop profiles quickly.
* Real-time applications such as voice and video when faced with increased
latency or jitter essentially drop the traffic to preserve quality.
* Upper layer protocols typically have mechanisms to correct for missing or
corrupted packets when sent via connectionless protocols.

So if those three things are true, is policing voip or TCP traffic (with a
Bc and Be properly defined) any ³worse² than shaping/queuing?  I¹m
struggling to find literature comparing the two beyond ³policing drops
shaping queues².  

Any thoughts or links would be appreciated.

-d


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