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

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


> 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?

(cesky, pictures)
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at