Re: [PATCH] sched/fair: Fix frequency selection for non invariant case

[Thorsten Leemhuis]

Linus, what...

On 14.02.24 18:22, Vincent Guittot wrote:
> On Wed, 14 Feb 2024 at 18:20, Linus Torvalds
> <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
>> On Wed, 14 Feb 2024 at 09:12, Jon Hunter <jonathanh@xxxxxxxxxx> wrote:
>>> We have also observed a performance degradation on our Tegra platforms
>>> with v6.8-rc1. Unfortunately, the above change does not fix the problem
>>> for us and we are still seeing a performance issue with v6.8-rc4. For
>>> example, running Dhrystone on Tegra234 I am seeing the following ...
>>> [...]
>>> If I revert this change and the following ...
>>>   b3edde44e5d4 ("cpufreq/schedutil: Use a fixed reference frequency")
>>>   f12560779f9d ("sched/cpufreq: Rework iowait boost")
>>>   9c0b4bb7f630 ("sched/cpufreq: Rework schedutil governor
>>> ... then the perf is similar to where it was ...
>>
>> Ok, guys, this whole scheduler / cpufreq rewrite seems to have been
>> completely buggered.
>> [...]
> This should fix it:
> https://lore.kernel.org/lkml/20240117190545.596057-1-vincent.guittot@xxxxxxxxxx/

..do you want me to do in situations like this? I'm asking, as I see
situations like this frequently -- e.g. people reporting problems a
second, third, or fourth time while the fix is already sitting in -next
for a few days.

Want me to list them in the weekly reports so that you can cherry-pick
them from -next if you want?

Ciao, Thorsten