[Bug 100771] When activating ignore_nice_load with governor ondemand performance drops for normal processes.

https://bugzilla.kernel.org/show_bug.cgi?id=100771

--- Comment #5 from Chen Yu <[email protected]> ---
(In reply to calvaris from comment #4)
> (In reply to Chen Yu from comment #3)
> > 2.When you enable ignore_nice_load, the task_b with nice = 1 will be
> > considered to be idle, which means that, the total time task_b is running,
> > will be added to current cpu's idle time, which will cause the cpufreq
> > governor to treat the cpu load lower than when ignore_nice_load disabled.
> 
> I understand the rationale you explain if we apply it only to idle tasks.
> What I don't agree with is that tasks with idle priority can slow down tasks
> with normal priority.
Do you mean idle tasks = task_b in above context? Why task_b slows down the
normal priority task is because that, the cpufreq decrease due to task_b's high
nice value, and task_a is scheduled on the same cpu.

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