[Cake] openwrt was changing fq_codel quantum default
dave.taht at gmail.com
Tue Dec 8 08:47:34 EST 2015
I did not like it when nbd changed the default quantum for the native qdisc.
So I support this change. That said, it has a negative effect at lower
rates (50mbit and below), when unshaped, and that bugs me also.
Let's go make home routers and wifi faster! With better software!
On Tue, Dec 8, 2015 at 10:59 AM, Kevin Darbyshire-Bryant
<kevin at darbyshire-bryant.me.uk> wrote:
> 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?
> 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
> 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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