[Codel] fq_codel_drop vs a udp flood

[Roman Yeryomin]

On 5 May 2016 at 19:25, Roman Yeryomin <leroi.lists at gmail.com> wrote:
> On 5 May 2016 at 19:12, Eric Dumazet <eric.dumazet at gmail.com> wrote:
>> On Thu, 2016-05-05 at 17:53 +0300, Roman Yeryomin wrote:
>>
>>>
>>> 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
>>
>>
>> Limit of 1024 packets and 1024 flows is not wise I think.
>>
>> (If all buckets are in use, each bucket has a virtual queue of 1 packet,
>> which is almost the same than having no queue at all)
>>
>> I suggest to have at least 8 packets per bucket, to let Codel have a
>> chance to trigger.
>>
>> So you could either reduce number of buckets to 128 (if memory is
>> tight), or increase limit to 8192.
>
> Will try, but what I've posted is default, I didn't change/configure that.

So it didn't change anything :(
Do you want new stats?

Regards,
Roman