[Bug 60911] [ivb] performance regression with ioquake3 based engines 3.10->3.11

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=60911

--- Comment #7 from Peter Weber <bugs at ttyhoney.com> ---
I've found the reason. It not caused by your code!
The new(?) kernel option CONFIG_CPU_IDLE_GOV_MENU is causing the decreased
framerate. I disabled it and the performance returned back to the old normal
level.

I enabled CONFIG_CPU_IDLE_GOV_MENU because I use also the other tickless stuff
in the kernel. The configuration options doesn't include an inline
documentation or any warning that it can affect performance.

https://lwn.net/Articles/352180/

This change seems to be pretty old, but the "public" kernel-option seem to be
new and is shown during "make oldconfig" from "3.10" to "3.11". I know it is
not your stuff, but may I ask you for a guess:
Should I contact someone, for adding a explaining documentation about it?


Sorry for disrubting you during your weekend!
Thank you for your fast response.
Peter

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