Intel Motherboards - ITX-n3700 CPU Scaling Fedora 24

ITX-n3700 CPU Scaling Fedora 24

Printed From: ASRock.com
Category: Technical Support
Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=3239
Printed Date: 22 May 2024 at 4:27am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: ITX-n3700 CPU Scaling Fedora 24

Posted By: JustMeHere
Subject: ITX-n3700 CPU Scaling Fedora 24
Date Posted: 14 Aug 2016 at 12:41am

I cannot get my ITX-N3700 to change frequencies in Fedora 24...Google has been little help.

I'm running "dd if=/dev/zero of=/dev/null" x 3 times

[root@sip ~]# cat /sys/devices/system/cpu/cpu?/cpufreq/cpuinfo_cur_freq

479937

480000

[root@sip ~]# cat /sys/devices/system/cpu/cpu?/cpufreq/scaling_governor

performance

[root@sip ~]# cat /sys/devices/system/cpu/cpu?/cpufreq/scaling_max_freq

2400000

[root@sip ~]# uptime

12:39:04 up 13:19, 2 users, load average: 3.03, 3.01, 2.59

I'm booting UEFI. I have tried both settings for SpeedStep (enabled / disabled). I have the system running in "Sport" mode.

Where else to look? Help is appreciated.

Replies:

Posted By: JustMeHere
Date Posted: 14 Aug 2016 at 2:42am

I've disabled intel_pstate and now I'm up at full CPU. I currently have speedstep turned off in UEFI. Once I can get to the machine, I will turn that back on and post further updates.

There seems to be an issue with the intel_pstate and Fedora 24 with this Chipset maybe.

Here's some info on p-state: https://www.kernel.org/doc/Documentation/cpu-freq/intel-pstate.txt

I enabled tracing and could confirm that the cores would not scale up.

Posted By: JustMeHere
Date Posted: 14 Aug 2016 at 5:35am

Yep this is the fix. Now working as expected:

[root@sip ~]# cpupower frequency-info

analyzing CPU 0:

driver: acpi-cpufreq

CPUs which run at the same hardware frequency: 0

CPUs which need to have their frequency coordinated by software: 0

maximum transition latency: 10.0 us

hardware limits: 480 MHz - 1.60 GHz

available frequency steps: 1.60 GHz, 1.60 GHz, 1.52 GHz, 1.44 GHz, 1.36 GHz, 1.28 GHz, 1.20 GHz, 1.12 GHz, 1.04 GHz, 960 MHz, 880 MHz, 800 MHz, 720 MHz, 640 MHz, 560 MHz, 480 MHz

available cpufreq governors: conservative userspace powersave ondemand performance

current policy: frequency should be within 480 MHz and 1.60 GHz.

The governor "ondemand" may decide which speed to use

within this range.

current CPU frequency: 480 MHz (asserted by call to hardware)

boost state support:

Supported: yes

Active: yes

[root@sip ~]#

Running "dd if=/dev/zero of=/dev/null"

As expected one core in at full speed:

[root@sip ~]# cat /sys/devices/system/cpu/cpu?/cpufreq/cpuinfo_cur_freq

560000

480000

1601000

[root@sip ~]#

Now just to figure out turbo.

Posted By: JustMeHere
Date Posted: 15 Aug 2016 at 1:03am

Hmmm, switched back to intel_pstate and cpu is scaling now. Smile

Posted By: parsec
Date Posted: 15 Aug 2016 at 11:03am

Thanks for this information, it may help someone, someday.

Sorry, but most people use Windows, for reasons like the one you had. Plus they don't have the experience to know what to do.

When using Linux, you are basically on your own, besides Linux forums. At least Intel provides a bit of support with drivers, or links to where drivers can be found.

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