From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 100771] When activating ignore_nice_load with governor ondemand
 performance drops for normal processes.
Date: Wed, 16 Dec 2015 15:11:33 +0000
Message-ID: <bug-100771-12968-Kb0rsx8GLH@https.bugzilla.kernel.org/>
References: <bug-100771-12968@https.bugzilla.kernel.org/>
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https://bugzilla.kernel.org/show_bug.cgi?id=100771

--- Comment #3 from Chen Yu <yu.c.chen@intel.com> ---
This is a normal behavior IMO. 

1. task_b with nice = 1 does not mean task_a will always occupy the time slice,
it is CFS scheduler, which means even task with nice = 19 will get chance to
run.
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.

Yu

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