Re: [PATCH 2/2] cpufreq: ondemand: Eliminate the deadband effect

From: Pavel Machek
Date: Fri Jul 11 2014 - 12:57:20 EST


Hi!

> Tested on Intel i7-3770 CPU @ 3.40GHz and on ARM quad core 1500MHz Krait
> (Android smartphone).
> Benchmarks on Intel i7 shows a performance improvement on low and medium
> work loads with lower power consumption. Specifics:
>
> Phoronix Linux Kernel Compilation 3.1:
> Time: -0.40%, energy: -0.07%
> Phoronix Apache:
> Time: -4.98%, energy: -2.35%
> Phoronix FFMPEG:
> Time: -6.29%, energy: -4.02%

Hmm. Intel i7 should be race-to-idle machine. So basically rule like
if (load > 0) go to max frequency else go to lowest frequency would do
the right thing in your test, right?

So... should we do that, or do we need better benchmark?
Pavel

--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/