Problem using HTB

[Abhishek Gupta <abhishek@xxxxxxxxxxxxxxxxxxxxx>]

hello everybody                                                                 
                                                                                
                                                          
I am working on a project related to QoS. I am using Linux's tc to              
                             
configure my PC based router.                                                   
                             
My setup is as follows:-
                                                                                
                                                                                
                                                 
              eth0       eth1            eth0      eth0                         
                             
PC-based server|----------|PC-based Router|---------|PC-Based Client            
                                                          
                            (using tc)                                          
                                                                                
                                                        
* All my ethernet cards are on 100Mbps lan                                      
                             
* Traffic generators being used:                                                
                               
  > UDP: gen_send @ about 1Mbps                                                 
                                 
    (http://www.citi.umich.edu/projects/qbone/generator.html)                   
                             
* Kernel versions being used:-                                                  
                               
  > At Router: linux-2.4.20                                                     
                               
  > At Client and Server: Linux-2.4.7-10                                        
                             
* iproute2 versions:-                                                           
                               
  > At Router: iproute2-ss020116                                                
                               
  > At Client and Server: iproute2-ss010824                                     
                             
* Packets before leaving sever and client are being marked with DSCP bits       
                               
  using Linux's tc option; Marking is done based on two-tuples: 
  destination ip address and port number                                        
                                            
* At the Router, I have the following configuration(only related to HTB)        
                               
  for eth0 and similar configuration exits for eth1 too: 

---Router Configuration Starts Here-----                                        
                                                                                
                                                          
DEV0='eth0'                                                                     
                                                                                
                                                          
tc qdisc add dev $DEV0 parent 1: handle 2: htb default 30                       
                             
tc class add dev $DEV0 parent 2: classid 2:1 htb rate 100kbit burst 100 \       
                                
   ceil 100kbit                                                                 
                             
tc class add dev $DEV0 parent 2:1 classid 2:10 htb rate 60kbit burst 100 \      
                                
   ceil 100kbit                                                                 
                             
tc class add dev $DEV0 parent 2:1 classid 2:20 htb rate 30kbit burst 60 \       
                                
   ceil 100kbit                                                                 
                             
tc class add dev $DEV0 parent 2:1 classid 2:30 htb rate 10kbit burst 80 \       
                                
   ceil 100kbit                                                                 
                                                                                
                                                          
tc qdisc add dev $DEV0 parent 2:10 gred setup DPs 3 default 3 grio              
                             
tc qdisc change dev $DEV0 parent 2:10 gred limit 185000 min 11394 \  
   max 11395 burst 100 avpkt 128 bandwidth 100kbit DP 1 probability 1 \         
                                
   prio 1                                                                       
                             
tc qdisc change dev $DEV0 parent 2:10 gred limit 17972 min 4748 max 9493 \      
                                
   burst 50 avpkt 1000 bandwidth 100kbit DP 2 probability 0.01 prio 2           
                             
tc qdisc change dev $DEV0 parent 2:10 gred limit 4368 min 1796 max 3582 \       
                                
   burst 25 avpkt 1000 bandwidth 100kbit DP 3 probability 0.01 prio 2           
                                                                                
                                                          
tc qdisc add dev $DEV0 parent 2:20 gred setup DPs 2 default 2 grio              
                             
tc qdisc change dev $DEV0 parent 2:20 gred limit 52480 min 11311 \              
                                
   max 11312 burst 60 avpkt 256 bandwidth 100kbit DP 1 probability 1 \          
                                
   prio 1                                                                       
                             
tc qdisc change dev $DEV0 parent 2:20 gred limit 47184 min 5898 \               
                                
   max 11796 burst 60 avpkt 1000 bandwidth 100kbit DP 2 probability 0.01 \      
                                
   prio 2                                   
                                                                                
                             
tc qdisc add dev $DEV0 parent 2:30 gred setup DPs 1 default 1 grio              
                             
tc qdisc change dev $DEV0 parent 2:30 gred limit 15728 min 1966 \               
                                
   max 3932 burst 80 avpkt 200 bandwidth 100kbit DP 1 probability 0.04 \        
                                
   prio 1                                                                       
                                                                                
                                                          
-----Router Configuration Ends Here------                                       
                                                                                
                                                                                
                                                                                
       
Now, the problem is that when I am sending packets from just one UDP            
                             
source(at server), I am getting outbound bit rate at eth0(of Router) as 12kbps  
                                   
even though I have ceiled the corresponding HTB class to 100kbps; similar thing 
                                  
happens when I have two UDP sources(both at server).  So, even though           
                             
I have configured for 100kbps, I am getting only 12kbps as the link speed. 
                                                                                
                             
Please help me out.                                                             
                                                                                
                                                          
Abhishek         


=========================================================================
ABHISHEK GUPTA 
E-mail:abhishek_it_bhu@xxxxxxxxxxx
=========================================================================