Re: [LARTC] HTB stats

[Anton Yurchenko <phila@dg.net.ua>]

Stef Coene wrote:

>>>>1. why do I have "lended" for children classes almost the same as
>>>>"sent", who do they lend to? the neighboring classes?
>>>>        
>>>>
>>>Yes, to other classes.
>>>"lended is # of packets donated by this class (from its rate)"
>>>      
>>>
>>I did some experimenting, and had a root class and just 1 child class,
>>and this child class still had lended pkts to smbody. Who did it lend it
>>
>>    
>>
>Can you send me your script so I know the settings of rate and ceil ?  Or 
>maybe Devik knows the answer.
>  
>

----------------------------------------------------

Here goes
----------------------------------------------------


tc qd add dev eth0 root handle 1: htb default 2500

tc cl add dev eth0 root classid 1:1 htb rate 100mbit
tc cl add dev eth0 parent 1:1 classid 1:100 rate 100kbit
tc cl add dev eth0 parent 1:1 classid 1:101 rate 100kbit
# to catch all that goes to default
tc cl add dev eth0 parent 1:1 classid 1:2500 rate 1Mbit

iptables -t mangle -A PREROUTING -s 172.20.0.1 -j MARK --set-mark 1
iptables -t mangle -A PREROUTING -d 172.20.0.1 -j MARK --set-mark 2

tc fi add dev eth0 protocol ip handle 1 fw classid 1:100
tc fi add dev eth0 protocol ip handle 2 fw classid 1:101

#> tc fi ls dev eth0

filter parent 1: protocol ip pref 49151 fw 
filter parent 1: protocol ip pref 49151 fw handle 0x2 classid 1:101 
filter parent 1: protocol ip pref 49152 fw 
filter parent 1: protocol ip pref 49152 fw handle 0x1 classid 1:100 

#> tc qd ls dev eth0
qdisc htb 1: r2q 10 default 2500 dcache 0
 deq_util 1/1000000 deq_rate 33 trials_per_deq 0
 dcache_hits 0 direct_packets 13403


#> iptables -t mangle -L

Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination         
MARK       all  --  dg                   anywhere           MARK set 0x1 
MARK       all  --  anywhere             dg                 MARK set 0x2 

Chain INPUT (policy ACCEPT)
target     prot opt source               destination         
MARK       all  --  dg                   anywhere           MARK set 0x1 

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         
MARK       all  --  anywhere             dg                 MARK set 0x2 

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination         


#> tc -s -d cl ls dev eth0

class htb 1:101 parent 1:1 prio 0 rate 100Kbit ceil 100Kbit burst 1727b/8 mpu 0b cburst 1727b/8 mpu 0b quantum 1280 level 0 
 Sent 42103 bytes 638 pkts (dropped 0, overlimits 698) 
 lended: 638 borrowed: 0 giants: 0 injects: 0
 tokens: 105984 ctokens: 105984

class htb 1:1 root prio 0 rate 100Mbit ceil 100Mbit burst 132644b/8 mpu 0b cburst 132644b/8 mpu 0b quantum 60000 level 3 
 Sent 1994248 bytes 4890 pkts (dropped 0, overlimits 0) 
 rate 6934bps 15pps 
 lended: 0 borrowed: 0 giants: 0 injects: 0
 tokens: 8289 ctokens: 8289

class htb 1:100 parent 1:1 prio 0 rate 100Kbit ceil 100Kbit burst 1727b/8 mpu 0b cburst 1727b/8 mpu 0b quantum 1280 level 0 
 Sent 0 bytes 0 pkts (dropped 0, overlimits 0) 
 lended: 0 borrowed: 0 giants: 0 injects: 0
 tokens: 110592 ctokens: 110592

class htb 1:2500 parent 1:1 prio 0 rate 1Mbit ceil 1Mbit burst 2909b/8 mpu 0b cburst 2909b/8 mpu 0b quantum 13107 level 0 
 Sent 1952145 bytes 4252 pkts (dropped 0, overlimits 12) 
 rate 6958bps 14pps 
 lended: 4252 borrowed: 0 giants: 0 injects: 0
 tokens: 17031 ctokens: 17031


----------------------------------------------------

so who does 1:2500 and 1:101 lend the tokens too, when none of the 
classes show borrowed > 0

>  
>
>>>>2. What is overlimits? is it incremented when certain pkt goest above
>>>>"rate", what if both "rate" and "ceil"? incremented twice?
>>>>        
>>>>
>>>overlimits : Packet is not sended due to ceil or rate restrictions  So
>>>there was to much data in the class.  But don't believe this too much. 
>>>It depends on how often the qdisc looked for packet.
>>>      
>>>
>>What does "looked" mean? could you pleases explain it a bit more? How
>>does it look for a pkt? I`m very interested in finding out what that
>>value means.
>>    
>>
>I quoted it from Devik, he his also reading this list, so Devik, can clear 
>this out.
>
>  
>
>>>>3. "dropped"- if the pkt is overlimit it may be dropped right? if it
>>>>cannot be delayed, right? is  this the reason why I have such a
>>>>difference between them?
>>>>        
>>>>
>>>Between what?
>>>      
>>>
>>Between "overlimits" and "dropped"
>>    
>>
>If the packet is overlimit, it can also be delayed to be send later.  
>
>Stef
>
>  
>


-- 

Anton Yurchenko<phila@dg.net.ua>
Digital Generation



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