Re: htb2 -> htb3 problems

Linux Advanced Routing and Traffic Control

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Michael Vasilenko (acid@xxxxxxxxx) wrote:
> devik (devik@xxxxxx) wrote:
> > > > I suppose the drop you see is CPU bound ? Did you profiled it
> > > > again ?
> > >
> > > No, CPU is about times more in idle state in htb3, and
> > > 5x lowest data rate. AFAIK, htb3 scheduler is faster, so that is the
> > > reason of moving to htb3.
> > 
> > ok then it is config issue probably. you should pin it down
> > to smallest possible number of classes for test (say up to
> > 5 classes) and then use tc -s show class ... to see internal
> > statistics. Look for classes with small (or negative)
> > tokens or ctokens - these are in throttling state and are
> > slowing throughtput - then think if it is ok ..
> 
> ok
> I'm creating root with 200Mbit
> and parent with 10Mbit/1Mbit

and qdisc stats (I have sfq attached to each leaf htb class):

 
qdisc sfq 5500: quantum 1514b limit 128p flows 128/1024 perturb 5sec
 Sent 52611108 bytes 35988 pkts (dropped 0, overlimits 0)
 backlog 22p

 qdisc sfq 3500: quantum 1514b limit 128p flows 128/1024 perturb 5sec
 Sent 1004864 bytes 18073 pkts (dropped 0, overlimits 0)

 qdisc htb 1: r2q 10 default 2500 direct_packets_stat 130 ver 3.13
 Sent 53627322 bytes 54191 pkts (dropped 0, overlimits 89908)
 backlog 22p

 
> class htb 1:5500 parent 1:2 leaf 5500: prio 0 quantum 131072 rate 10Mbit ceil 12Mbit burst 2Kb/8 mpu 0b cburst 0b/8 mpu 0b level 0
>  Sent 25443954 bytes 17155 pkts (dropped 0, overlimits 0)
>  rate 143050bps 97pps backlog 25p
>  lended: 17130 borrowed: 0 giants: 0
>  tokens: 335 ctokens: -787
> 
> class htb 1:1 root rate 200Mbit ceil 200Mbit burst 263690b/8 mpu 0b cburst 263690b/8 mpu 0b level 7
>  Sent 482570 bytes 8712 pkts (dropped 0, overlimits 0)
>  rate 2723bps 49pps
>  lended: 0 borrowed: 0 giants: 0
>  tokens: 8241 ctokens: 8241
> 
> class htb 1:2 root rate 200Mbit ceil 200Mbit burst 263690b/8 mpu 0b cburst 263690b/8 mpu 0b level 7
>  Sent 25406104 bytes 17130 pkts (dropped 0, overlimits 0)
>  rate 144147bps 98pps
>  lended: 0 borrowed: 0 giants: 0
>  tokens: 8195 ctokens: 8195
> 
> class htb 1:3500 parent 1:1 leaf 3500: prio 0 quantum 13107 rate 1Mbit ceil 1Mbit burst 2Kb/8 mpu 0b cburst 0b/8 mpu 0b level 0
>  Sent 482570 bytes 8712 pkts (dropped 0, overlimits 0)
>  rate 2739bps 49pps
>  lended: 8712 borrowed: 0 giants: 0
>  tokens: 12501 ctokens: -294
> 
> 
> so, rate is 1,2Mbit
> and what is meaning of negative ctokens?
>  
> > >From data you send one can't decide what's bad. In any case
> > and as I said before, behavioue changed a bit so that results
> > can be a bit different a may need tc script changes.
> > 
> > devik
> > 
> > _______________________________________________
> > LARTC mailing list / LARTC@xxxxxxxxxxxxxxx
> > http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
> 
> -- 
> Michael Vasilenko

-- 
Michael Vasilenko
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