Re: [PATCH V7 9/9] sched/rt: Remove default bandwidth control

[Michal Koutný]

On Wed, Nov 27, 2024 at 04:35:39PM GMT, Juri Lelli <juri.lelli@xxxxxxxxxx> wrote:
> > The default DL bandwidth is thus is 95%. The fair server is given 5%.
> > Is that 5% of those 95%?
> 
> Yes, it is indeed.

Thanks for navigating me. I have followup questions about
/proc/sys/kernel/sched_rt_runtime_us / /proc/sys/kernel/sched_rt_period_us
(a ratio, without CONGIG_RT_GROUP_SCHED)

- 0
  - disables DL, (not RT, so they can monopolize a CPU)
- 1
  - DL tasks can monopolize CPU, SCHED_NORMAL have 5% thanks to
    fair_server
- 1-Δ
  - SCHED_NORMAL tasks have
    - (1-Δ)*5% on behalf of DL (above RT)
    - Δ regularly (below RT)

Is this breakdown correct?
I'm wondering if different values of Δ mean anything or how they can be
used.

Regards,
Michal

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