You are not logged in.

#1 2014-07-13 10:35:01

abhinavk
Member
Registered: 2014-07-13
Posts: 3
Website

Fluctuating frequencies on idle (using on-demand governor)

After I installed Arch yesterday, I ran

watch grep \"cpu MHz\" /proc/cpuinfo

to check whether the frequency scaling is working fine.

The reading was fluctuating between 1200.00 and 2200.00 constantly on idle with 0.5% usage. While in Ubuntu based distributions, it remains on 1200.00 on idle, only increasing when I am doing something heavier. Both of the distributions are using ondemand governor by default. I got the same behavior after booting from the Arch ISO too. Is there something different about how kernel in Arch is compiled?

Machine: Dell Studio 1555
CPU: Intel Core 2 Duo T6600 2.20 GHz
RAM: 4 GB DDR2
GPU: AMD Mobility Radeon HD 4000
Kernel: 3.13.5

Offline

#2 2014-07-13 10:52:14

ugjka
Member
From: Latvia
Registered: 2014-04-01
Posts: 592

Re: Fluctuating frequencies on idle (using on-demand governor)

Ubuntu probably has different switching thresholds. https://wiki.archlinux.org/index.php/CP … _threshold

Offline

#3 2014-07-13 11:03:23

abhinavk
Member
Registered: 2014-07-13
Posts: 3
Website

Re: Fluctuating frequencies on idle (using on-demand governor)

ugjka wrote:

Ubuntu probably has different switching thresholds. https://wiki.archlinux.org/index.php/CP … _threshold

Nope. In both

cat /sys/devices/system/cpu/cpufreq/ondemand/up_threshold

returns 95.

EDIT: I tested several other distributions and upgraded their kernel to match the one found in either core repository (3.15.5) or the Arch ISO (3.15.3) and it turns out that Arch is the odd one out here. I'll test again once 3.16 comes out.

Last edited by abhinavk (2014-07-13 18:08:44)

Offline

Board footer

Powered by FluxBB