[Make-wifi-fast] [Codel] fq_codel_drop vs a udp flood

[Roman Yeryomin]

On 2 May 2016 at 19:14, Eric Dumazet <eric.dumazet at gmail.com> wrote:
> On Mon, 2016-05-02 at 18:43 +0300, Roman Yeryomin wrote:
>> On 2 May 2016 at 18:07, Eric Dumazet <eric.dumazet at gmail.com> wrote:
>> > On Mon, 2016-05-02 at 17:18 +0300, Roman Yeryomin wrote:
>> >
>> >> Imagine you are a video operator, have MacBook Pro, gigabit LAN and
>> >> NAS on ethernet side. You would want to get maximum speed. And
>> >> fq_codel just dropped it down to 550Mbps for TCP (instead of 750Mbps)
>> >> and to 30Mbps for UDP (instead of 900Mbps).
>> >> So, again, it looks broken to me.
>> >
>> > Can you show us your qdisc config ?
>>
>> Which build do you want? Before it broke or after?
>>
>
>
> I want to check your qdisc configuration, the one that you used and
> where you had fq_codel performance issues
>
> tc -s -d qdisc
>

qdisc fq_codel 0: dev eth0 root refcnt 2 limit 1024p flows 1024
quantum 1514 target 5.0ms interval 100.0ms ecn
 Sent 12306 bytes 128 pkt (dropped 0, overlimits 0 requeues 0)
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc mq 0: dev wlan0 root
 Sent 29775 bytes 254 pkt (dropped 0, overlimits 0 requeues 0)
 backlog 0b 0p requeues 0
qdisc fq_codel 0: dev wlan0 parent :1 limit 1024p flows 1024 quantum
1514 target 5.0ms interval 100.0ms ecn
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev wlan0 parent :2 limit 1024p flows 1024 quantum
1514 target 5.0ms interval 100.0ms ecn
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev wlan0 parent :3 limit 1024p flows 1024 quantum
1514 target 5.0ms interval 100.0ms ecn
 Sent 29775 bytes 254 pkt (dropped 0, overlimits 0 requeues 0)
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0
qdisc fq_codel 0: dev wlan0 parent :4 limit 1024p flows 1024 quantum
1514 target 5.0ms interval 100.0ms ecn
 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
 backlog 0b 0p requeues 0
  maxpacket 0 drop_overlimit 0 new_flow_count 0 ecn_mark 0
  new_flows_len 0 old_flows_len 0


Will try your patch now.

Regards,
Roman