[Codel] fq_codel_drop vs a udp flood

[Roman Yeryomin]

On 5 May 2016 at 19:42, Roman Yeryomin <leroi.lists at gmail.com> wrote:
> 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?

Just realized that the patch should be applied/ported to Linux kernel
OpenWrt part, not compat-wireless.
Will try to do that now.

Regards,
Roman