[LARTC] max latency with htb and wondershaper for voip and p2p

[sophana <sophana78@yahoo.fr>]

Hi

I'm actually using a wondershaper derived script.
The problem I have is that when I ping (ping is in high priority queue)
the ping time is not as low as I expected with p2p running:

760 packets transmitted, 760 received, 0% packet loss, time 759695ms
rtt min/avg/max/mdev = 39.667/62.863/598.539/33.287 ms, pipe 2

With voip, it is much better with the qos but it is still a little choppy.

My line is an adsl 512/128 kbit/s. Assuming the biggest low prio packet 
is about 1.5kbyte, this makes a max latency of 93ms higher than min 
latency: 133ms in my case. (that's what I notice on the ping times)

I don't understand why is voip still choppy.

In my config, can I assume that packets in 1:10 have the highest 
priority even with htb? (if the 1:10 rate is not reached).
Do I need to setup a prio qdisc instead of htb for voip?
If I lower the mtu of the p2p software to 750byte for example, will I 
get a max latency of 87ms?
Can I do voip and P2P together with htb with such a line?
Thanks for your help.


     qdisc htb 1: r2q 1 default 20 direct_packets_stat 0
qdisc htb 1:      :       9637 ( 77.096000 kbit/s) sent05656509  :
      Sent 305656509 bytes 1228041 pkts (dropped 0, overlimits 559094 
requeues 0)
     qdisc sfq 10: parent 1:10 limit 128p quantum 1514b perturb 10sec
qdisc sfq 10:     :        588 (  4.704000 kbit/s) sent(498626  :
      Sent 28498626 bytes 489927 pkts (dropped 0, overlimits 0 requeues 0)
     qdisc sfq 20: parent 1:20 limit 128p quantum 1514b perturb 10sec
qdisc sfq 20:     :        228 (  1.824000 kbit/s) sent‚88143  :
      Sent 8288143 bytes 81245 pkts (dropped 0, overlimits 0 requeues 0)
     qdisc sfq 30: parent 1:30 limit 128p quantum 1514b perturb 10sec
qdisc sfq 30:     :       8821 ( 70.568000 kbit/s) sent&8869740  :
      Sent 268869740 bytes 656869 pkts (dropped 0, overlimits 0 requeues 0)
     qdisc ingress ffff: ----------------
qdisc ingress ffff: :       7005 ( 56.040000 kbit/s) sent\x127032425  :
      Sent 127032425 bytes 1036821 pkts (dropped 52, overlimits 0 
requeues 0)
     class htb 1:1 root rate 110Kbit ceil 110Kbit burst 1612b cburst 1612b
class htb 1:1     :       9637 ( 77.096000 kbit/s) sent05656509  :
      Sent 305656509 bytes 1228041 pkts (dropped 0, overlimits 0 requeues 0)
      rate 7480bit 29pps
      lended: 400601 borrowed: 0 giants: 0
      tokens: 116551 ctokens: 116551

     class htb 1:10 parent 1:1 leaf 10: prio 0 rate 55Kbit ceil 110Kbit 
burst 6Kb cburst 1612b
class htb 1:10    :        588 (  4.704000 kbit/s) sent(498626  :
      Sent 28498626 bytes 489927 pkts (dropped 0, overlimits 0 requeues 0)
      rate 715bit 12pps
      lended: 489927 borrowed: 0 giants: 0
      tokens: 907972 ctokens: 116551

     class htb 1:20 parent 1:1 leaf 20: prio 1 rate 33Kbit ceil 110Kbit 
burst 1603b cburst 1612b
class htb 1:20    :        228 (  1.824000 kbit/s) sent‚88143  :
      Sent 8288143 bytes 81245 pkts (dropped 0, overlimits 0 requeues 0)
      rate 133bit 1pps
      lended: 80319 borrowed: 926 giants: 0
      tokens: 378446 ctokens: 116551

     class htb 1:30 parent 1:1 leaf 30: prio 2 rate 22Kbit ceil 110Kbit 
burst 1601b cburst 1612b
class htb 1:30    :       8821 ( 70.568000 kbit/s) sent&8869740  :
      Sent 268869740 bytes 656869 pkts (dropped 0, overlimits 0 requeues 0)
      rate 6686bit 15pps
      lended: 257194 borrowed: 399675 giants: 0
      tokens: 101987 ctokens: 104038



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