[LARTC] about the traffic control

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Hi, all:
   I'm involved in the study about the QoS,but have some problems , hope 
someone could help me answer:
    1. Why most traffic shaping implement in the egress side (Uplink) rather
        than the ingress side(Dnlink)?(e.g. why put the police rule on the smaller
        bandwidth side but not put on the larger side)
  
    2. I can't differ the functionalities exactly between SFQ and HTB 
        , they're both the queueing disciplines,HTB is used to manage bandwidth
        ,with the DRR displine in it , also be a scheduler to send packets,
       so, why we still need SFQ?
  
    3. Does anybody know that where I can find the VoIP and VOD traffic
     generator ? 'cause I want to evaluate the performance in the linux DiffServ
     I don't know if the iperf can generate the above mentioned application traffic?
     
Fionna
   

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