Re: [Cake] fq_codel on 3g network in Mauritius

[Loganaden Velvindron <loganaden@gmail.com>]

I've set the interval to 350ms, by using advanced option:

Result is better:

http://www.dslreports.com/speedtest/4520697


I will submit a patch for sqm-luci so that the interval is
configurable easily via web ui for African countries where the latency
tends to be of the order of 300ms to 600ms, particularly on 3g
connections.


tc -s qdisc
qdisc fq_codel 0: dev eth0 root refcnt 2 limit 1024p flows 1024
quantum 300 target 5.0ms interval 100.0ms ecn
 Sent 3493746 bytes 5455 pkt (dropped 0, overlimits 0 requeues 2)
 backlog 0b 0p requeues 2
  maxpacket 256 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc htb 1: dev eth1 root refcnt 2 r2q 10 default 12
direct_packets_stat 3 direct_qlen 1000
 Sent 4869533 bytes 18710 pkt (dropped 0, overlimits 8200 requeues 0)
 backlog 0b 0p requeues 0
qdisc fq_codel 110: dev eth1 parent 1:11 limit 1001p flows 1024
quantum 300 target 41.1ms interval 350.0ms
 Sent 12742 bytes 115 pkt (dropped 0, overlimits 0 requeues 0)
 backlog 0b 0p requeues 0
  maxpacket 256 drop_overlimit 0 new_flow_count 84 ecn_mark 0
  new_flows_len 0 old_flows_len 1
qdisc fq_codel 120: dev eth1 parent 1:12 limit 1001p flows 1024
quantum 300 target 41.1ms interval 350.0ms
 Sent 4854326 bytes 18569 pkt (dropped 85, overlimits 0 requeues 0)
 backlog 0b 0p requeues 0
  maxpacket 1454 drop_overlimit 0 new_flow_count 4831 ecn_mark 0
  new_flows_len 1 old_flows_len 1
qdisc fq_codel 130: dev eth1 parent 1:13 limit 1001p flows 1024
quantum 300 target 41.1ms interval 350.0ms
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
 backlog 0b 0p requeues 0
  maxpacket 256 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc ingress ffff: dev eth1 parent ffff:fff1 ----------------
 Sent 21938964 bytes 23336 pkt (dropped 0, overlimits 0 requeues 0)
 backlog 0b 0p requeues 0
qdisc mq 0: dev wlan0 root
 Sent 18874833 bytes 18494 pkt (dropped 0, overlimits 0 requeues 2)
 backlog 0b 0p requeues 2
qdisc htb 1: dev ifb4eth1 root refcnt 2 r2q 10 default 10
direct_packets_stat 0 direct_qlen 32
 Sent 22265602 bytes 23335 pkt (dropped 0, overlimits 5193 requeues 0)
 backlog 0b 0p requeues 0
qdisc fq_codel 110: dev ifb4eth1 parent 1:10 limit 1001p flows 1024
quantum 300 target 5.0ms interval 350.0ms ecn
 Sent 22265602 bytes 23335 pkt (dropped 0, overlimits 0 requeues 0)
 backlog 0b 0p requeues 0
  maxpacket 1454 drop_overlimit 0 new_flow_count 4392 ecn_mark 0
  new_flows_len 1 old_flows_len 1

On Sat, Jul 23, 2016 at 10:59 PM, Loganaden Velvindron
<loganaden@gmail.com> wrote:
> After going through:
>
> https://tools.ietf.org/html/draft-ietf-aqm-fq-codel-06
>
> I think that I should remove the itarget and etarget, and set the
> Interval rather to 500ms.
>
>
>
>    The _interval_ parameter has the same semantics as CoDel and is used
>    to ensure that the minimum sojourn time of packets in a queue used as
>    an estimator by the CoDel control algorithm is a relatively up-to-
>    date value.  That is, CoDel only reacts to delay experienced in the
>    last epoch of length interval.  It SHOULD be set to be on the order
>    of the worst-case RTT through the bottleneck to give end-points
>    sufficient time to react.
>
>    The default interval value is 100 ms.
>
> The default interval value is not suited for my 3g connection where
> the worse-case RTT is much higher.
>
>
>
> On Sat, Jul 23, 2016 at 10:36 PM, Loganaden Velvindron
> <loganaden@gmail.com> wrote:
>>>         It seems the initial burst like behavior from the earlier test was a false positive; these test are still not beautiful, but at least they do not indicate that HTB+fq_codel as configured on your system do not suffer from uncontrolled bursty-ness. Unfortunately, I have no real insight or advice to offer how to improve your situation (short f setting the shaper rates considerably lower).
>>>         BTW, “tc -d qdisc” and “tc -s disc” give a bit more information, and “tc class show dev eth1” and “tc class show dev ifb4eth1” will also offer more detail about your setup.
>>>
>>>
>>> Best Regards
>>>         Sebastian
>>>
>>>
>>>
>>
>> tc -d qdisc:
>>
>> qdisc fq_codel 0: dev eth0 root refcnt 2 limit 1024p flows 1024
>> quantum 300 target 5.0ms interval 100.0ms ecn
>> qdisc htb 1: dev eth1 root refcnt 2 r2q 10 default 12
>> direct_packets_stat 5 ver 3.17 direct_qlen 1000
>> qdisc fq_codel 110: dev eth1 parent 1:11 limit 1001p flows 1024
>> quantum 300 target 500.0ms interval 100.0ms
>> qdisc fq_codel 120: dev eth1 parent 1:12 limit 1001p flows 1024
>> quantum 300 target 500.0ms interval 100.0ms
>> qdisc fq_codel 130: dev eth1 parent 1:13 limit 1001p flows 1024
>> quantum 300 target 500.0ms interval 100.0ms
>> qdisc ingress ffff: dev eth1 parent ffff:fff1 ----------------
>> qdisc mq 0: dev wlan0 root
>> qdisc htb 1: dev ifb4eth1 root refcnt 2 r2q 10 default 10
>> direct_packets_stat 0 ver 3.17 direct_qlen 32
>> qdisc fq_codel 110: dev ifb4eth1 parent 1:10 limit 1001p flows 1024
>> quantum 300 target 500.0ms interval 100.0ms ecn
>>
>> tc -s qdisc:
>>
>> qdisc fq_codel 0: dev eth0 root refcnt 2 limit 1024p flows 1024
>> quantum 300 target 5.0ms interval 100.0ms ecn
>>  Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
>>  backlog 0b 0p requeues 0
>>   maxpacket 256 drop_overlimit 0 new_flow_count 0 ecn_mark 0
>>   new_flows_len 0 old_flows_len 0
>> qdisc htb 1: dev eth1 root refcnt 2 r2q 10 default 12
>> direct_packets_stat 5 direct_qlen 1000
>>  Sent 23456195 bytes 109776 pkt (dropped 0, overlimits 86210 requeues 0)
>>  backlog 0b 4p requeues 0
>> qdisc fq_codel 110: dev eth1 parent 1:11 limit 1001p flows 1024
>> quantum 300 target 500.0ms interval 100.0ms
>>  Sent 14760 bytes 164 pkt (dropped 0, overlimits 0 requeues 0)
>>  backlog 0b 0p requeues 0
>>   maxpacket 256 drop_overlimit 0 new_flow_count 163 ecn_mark 0
>>   new_flows_len 1 old_flows_len 0
>> qdisc fq_codel 120: dev eth1 parent 1:12 limit 1001p flows 1024
>> quantum 300 target 500.0ms interval 100.0ms
>>  Sent 23440300 bytes 109600 pkt (dropped 115, overlimits 0 requeues 0)
>>  backlog 5816b 4p requeues 0
>>   maxpacket 1454 drop_overlimit 0 new_flow_count 15749 ecn_mark 0
>>   new_flows_len 0 old_flows_len 1
>> qdisc fq_codel 130: dev eth1 parent 1:13 limit 1001p flows 1024
>> quantum 300 target 500.0ms interval 100.0ms
>>  Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
>>  backlog 0b 0p requeues 0
>>   maxpacket 256 drop_overlimit 0 new_flow_count 0 ecn_mark 0
>>   new_flows_len 0 old_flows_len 0
>> qdisc ingress ffff: dev eth1 parent ffff:fff1 ----------------
>>  Sent 190858989 bytes 149884 pkt (dropped 0, overlimits 0 requeues 0)
>>  backlog 0b 0p requeues 0
>> qdisc mq 0: dev wlan0 root
>>  Sent 194287835 bytes 153002 pkt (dropped 0, overlimits 0 requeues 7)
>>  backlog 0b 0p requeues 7
>> qdisc htb 1: dev ifb4eth1 root refcnt 2 r2q 10 default 10
>> direct_packets_stat 0 direct_qlen 32
>>  Sent 192953486 bytes 149877 pkt (dropped 0, overlimits 41505 requeues 0)
>>  backlog 0b 0p requeues 0
>> qdisc fq_codel 110: dev ifb4eth1 parent 1:10 limit 1001p flows 1024
>> quantum 300 target 500.0ms interval 100.0ms ecn
>>  Sent 192953486 bytes 149877 pkt (dropped 0, overlimits 0 requeues 0)
>>  backlog 0b 0p requeues 0
>>   maxpacket 1454 drop_overlimit 0 new_flow_count 16778 ecn_mark 0
>>   new_flows_len 1 old_flows_len 2
>>
>>
>> tc class show dev eth1
>> class htb 1:11 parent 1:1 leaf 110: prio 1 rate 128Kbit ceil 100Kbit
>> burst 1600b cburst 1600b
>> class htb 1:1 root rate 300Kbit ceil 300Kbit burst 1599b cburst 1599b
>> class htb 1:10 parent 1:1 prio 0 rate 300Kbit ceil 300Kbit burst 1599b
>> cburst 1599b
>> class htb 1:13 parent 1:1 leaf 130: prio 3 rate 50Kbit ceil 284Kbit
>> burst 1600b cburst 1599b
>> class htb 1:12 parent 1:1 leaf 120: prio 2 rate 50Kbit ceil 284Kbit
>> burst 1600b cburst 1599b
>> class fq_codel 110:188 parent 110:
>> class fq_codel 120:3d6 parent 120:
>>
>>
>> tc class show dev ifb4eth1:
>> class htb 1:10 parent 1:1 leaf 110: prio 0 rate 19600Kbit ceil
>> 19600Kbit burst 1597b cburst 1597b
>> class htb 1:1 root rate 19600Kbit ceil 19600Kbit burst 1597b cburst 1597b
>> class fq_codel 110:2f1 parent 110:
>> class fq_codel 110:330 parent 110:
>>
>> I changed the target from 350ms to 500ms for both ingress and egree,
>> and the throughput seem to be better:
>>
>> http://www.dslreports.com/speedtest/4515961