[Cake] apu2 sqm/htb issue + a minor win for speeding up fq_codel itself

[Dave Taht]

my guess is that burst and cburst should scale roughly as a function
of the bytes that can fit into 1ms.
On Tue, Sep 4, 2018 at 2:14 PM Dave Taht <dave.taht at gmail.com> wrote:
>
> making htb's cburst and burst parameters 64k gets the APU2  up to
> where it can shape 900mbits. 3 ksoftirq handlers start getting cpu
> time, and we end up 54% idle to achiefe that.
>
> I should really go around running my own old code. I was deeply
> involved in sqm when we still had to run at sub 200mbit levels. since
> then it's been
> mostly tbf (burst 64k) + fq_codel or cake, and me ignoring various bug
> reports about it not scaling well enough at higher rates.
> On Tue, Sep 4, 2018 at 12:59 PM Dave Taht <dave.taht at gmail.com> wrote:
> >
> > less than scientifically (via monitoring top) - on the apu2
> >
> > 100Mbit sqm (htb + fq_codel)
> >
> > fq_codel_mainline | fq_codel_fast
> > idle 78.8                | 83.5 |
> > si    20                   | 16.1 |
> >
> > Yea! But:
> >
> > 900Mbit sqm (htb + fq_codel)
> >
> > fq_codel_mainline | fq_codel_fast
> > idle 74.4                | 74.4 |
> > si    25                   | 25.1 |
> >
> > Here: completely bottlenecked on ksoftirqd - and I only get 340Mbits
> > out of the 900mbit setting. quantum 96k and burst of 15000. Haven't
> > fiddled with higher values yet...
> >
> >
> >
> > --
> >
> > Dave Täht
> > CEO, TekLibre, LLC
> > http://www.teklibre.com
> > Tel: 1-669-226-2619
>
>
>
> --
>
> Dave Täht
> CEO, TekLibre, LLC
> http://www.teklibre.com
> Tel: 1-669-226-2619



-- 

Dave Täht
CEO, TekLibre, LLC
http://www.teklibre.com
Tel: 1-669-226-2619