[Cake] openwrt was changing fq_codel quantum default

Tue Dec 8 01:59:53 PST 2015

Did anyone else see https://dev.openwrt.org/ticket/21326 and fixing
commit https://dev.openwrt.org/changeset/47811 go through in the early
hours of this morning?

TLDR;

q->quantum = 300;  //was

q->quantum = psched_mtu(qdisc_dev(sch));   //now returned to kernel default

" i ran into cpu limits with sirq on archer c7v2 while testing ingress
shaping.

it seems to me that quantum < mtu is very costly (at cpu) with higher
(50mbps) bandwidths

    ~40% sirq load with quantum 1522+
    90% at quantum mtu/2"

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