Linux amd turbo boost

How to enable AMD Turbo Core on Ubuntu 14.04?

I’m using Ubuntu 14.04 (3.13.0-24-generic kernel) on AMD A8-4500m based laptop, and I’ve recently noticed, that AMD Turbo Core is not working at all. Everything works on Windows, however, on Linux CPU frequency can’t get past 1.9 GHz (checked with cpufreq-aperf ). Here is output of cpupower frequency-info , notice Active: no under boost state support:

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: 4.0 us. hardware limits: 1.40 GHz - 1.90 GHz available frequency steps: 1.90 GHz, 1.80 GHz, 1.70 GHz, 1.60 GHz, 1.40 GHz available cpufreq governors: conservative, ondemand, userspace, powersave, performance current policy: frequency should be within 1.90 GHz and 1.90 GHz. The governor "ondemand" may decide which speed to use within this range. current CPU frequency is 1.90 GHz (asserted by call to hardware). cpufreq stats: 1.90 GHz:32,63%, 1.80 GHz:0,74%, 1.70 GHz:0,50%, 1.60 GHz:1,20%, 1.40 GHz:64,93% (9287) boost state support: Supported: yes Active: no Boost States: 2 Total States: 8 Pstate-Pb0: 2800MHz (boost state) Pstate-Pb1: 2300MHz (boost state) Pstate-P0: 1900MHz Pstate-P1: 1800MHz Pstate-P2: 1700MHz Pstate-P3: 1600MHz Pstate-P4: 1400MHz Pstate-P5: 900MHz 

More tests (ran with ondemand scheduler and 3 instances of ffmpeg decoding 1920×1080 H.264 video in background):

[m132@m132 turbostat]$ sudo cpupower monitor [sudo] password for m132: |Mperf || Idle_Stats CPU | C0 | Cx | Freq || POLL | C1 | C2 0| 97,78| 2,22| 1821|| 0,00| 0,00| 0,00 1| 97,84| 2,16| 1821|| 0,00| 0,00| 0,00 2| 99,22| 0,78| 1807|| 0,00| 0,00| 0,00 3| 99,18| 0,82| 1808|| 0,00| 0,00| 0,00 [m132@m132 turbostat]$ sudo ./turbostat cor CPU GHz TSC time 1.81 1.90 5** 0 0 1.81 1.90 5** 1 1 1.81 1.90 2 2 1.80 1.90 3 3 1.81 1.90 

EDIT: It seems like Trinity series processors have it’s own BAPM switch in source. It’s located in drivers/gpu/drm/radeon/trinity_dpm.c and it’s (at the time of writing) enabled only for MSI boards, because of stability issues. To enable it, open this file, find this line:

Change false to true, then compile and install new kernel. You should get a kernel panic boost working now. Keep in mind that CPU power is also shared with GPU, so you’ll almost never get the highest frequency available if GPU is also in use.

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Arch Linux

Linux has been working great, even with optimus management, which has just been great.

That said, I just got around to managing CPU frequencies and governors; for that, I am using cpupower and cpupower-gui.

I couldn’t help but notice that my maximum available cpu frequency was 3200MHz, which is way below what my cpu is capable of doing. I did some digging, and have enabled the boost flag in /sys/devices/system/cpu/cpufreq/boost. Before this change, the output of

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: Cannot determine or is not supported. hardware limits: 1.20 GHz - 3.20 GHz available frequency steps: 3.20 GHz, 1.30 GHz, 1.20 GHz available cpufreq governors: conservative ondemand userspace powersave performance schedutil current policy: frequency should be within 1.20 GHz and 3.20 GHz. The governor "powersave" may decide which speed to use within this range. current CPU frequency: Unable to call hardware current CPU frequency: 1.20 GHz (asserted by call to kernel) boost state support: Supported: yes Active: no

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: Cannot determine or is not supported. hardware limits: 1.20 GHz - 3.20 GHz available frequency steps: 3.20 GHz, 1.30 GHz, 1.20 GHz available cpufreq governors: conservative ondemand userspace powersave performance schedutil current policy: frequency should be within 1.20 GHz and 3.20 GHz. The governor "powersave" may decide which speed to use within this range. current CPU frequency: 1.20 GHz (asserted by call to hardware) boost state support: Supported: yes Active: yes Boost States: 0 Total States: 3 Pstate-P0: 3200MHz Pstate-P1: 1300MHz Pstate-P2: 1200MHz

Which at least means that I got cpupower to recognize that boost is active. The problem here, however, is that there are no available boost states, which makes the change entirely a symbolic one.

Is there a way for me to enable boost states, or to add some?

Last edited by pebble (2021-05-12 17:51:44)

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Arch Linux

Hi! I got an AMD A8-5545M APU with Radeon(tm) HD Graphics and I think it’s not using Turbo Boost.

In here it shows ‘Active: no’ and while I was looking for a solution to this problem I noticed some users have ‘Active: yes’
http://sprunge.us/WOHG

I tried:
cpupower frequency-set -g performance
cpupower frequency-set -g userspace
cpupower frequency-set -u 2.7GHz
cpupower frequency-set -f 2.7GHz

And in the end, it never goes beyond 1.7GHz

I know this CPU supports Turbo Boost as these pages show:
http://www.cpubenchmark.net/cpu.php?cpu … -5545M+APU — Description: Socket: FP2, Clockspeed: 1.7 GHz, Turbo Speed: 2.7 GHz, No of Cores: 4, Max TDP: 19 W
and this one:
http://www.notebookcheck.net/AMD-A-Seri … 798.0.html — Clock Rate 1700 — 2700 MHz

Doing:
watch grep \»cpu MHz\» /proc/cpuinfo
never goes beyond 1700MHz even though htop can reveal processors at 100%

I also saw the file:
/sys/devices/system/cpu/cpufreq/boost
but the value 1 was already there.

Can someone help me getting Turbo Boost to work? Thank you!

#2 2014-09-22 05:38:24

Re: AMD CPU Turbo Boost

Maybe it’s disabled by BIOS?

#3 2014-09-22 08:36:08

Re: AMD CPU Turbo Boost

My BIOS doesn’t have an option to set Turbo.

#4 2014-09-24 10:35:16

Re: AMD CPU Turbo Boost

hi, I you are really sure that your MB has Turbo Boost feature you can confirm if is enable with:

$ sudo 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: 4.0 us. hardware limits: 1.40 GHz - 4.00 GHz available frequency steps: 4.00 GHz, 1.40 GHz available cpufreq governors: ondemand, performance current policy: frequency should be within 1.40 GHz and 4.00 GHz. The governor "ondemand" may decide which speed to use within this range. current CPU frequency is 1.40 GHz (asserted by call to hardware). boost state support: Supported: yes Active: yes Boost States: 2 Total States: 7 Pstate-Pb0: 4200MHz (boost state) Pstate-Pb1: 4100MHz (boost state) Pstate-P0: 4000MHz Pstate-P1: 4000MHz Pstate-P2: 4000MHz Pstate-P3: 4000MHz Pstate-P4: 1400MHz

and to monitor frequencies you need use:

$ sudo cpupower monitor |Mperf || Idle_Stats CPU | C0 | Cx | Freq || POLL | C1 | C2 0| 18.34| 81.66| 3348|| 0.00| 1.36| 80.48 1| 10.85| 89.15| 3200|| 0.00| 1.20| 88.06 2| 15.73| 84.27| 2624|| 0.00| 1.18| 83.28 3| 16.76| 83.24| 3434|| 0.00| 6.09| 77.24 4| 19.67| 80.33| 3134|| 0.00| 3.49| 77.00 5| 14.26| 85.74| 3164|| 0.00| 12.21| 73.65 6| 18.12| 81.88| 2782|| 0.00| 1.70| 80.38 7| 7.96| 92.04| 2803|| 0.00| 0.43| 91.73

and to monitor in «live» you can use:

$ watch sudo cpupower monitor

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

I only have the max freq in bios settings when using Cool ‘n Quiet enable that is 4000 MHz but with «cpupower monitor» command I have the real, and the real freq goes up to 4400 MHz.

KF5 & Plasma5 (git versions) — Awesome WM
ASUS Sabertooth 990FX — AMD FX8350 — ATI Radeon HD 7970
[testing] repo

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Включение и отключение Turbo Boost в Linux

Бывает нужно отключить Turbo Boost или наоборот включить его, так же узнать текущие состояние. В Linux это можно сделать без перезагрузки в BIOS. Мы рассмотрим с помощью каких команд узнать текущие состояние, так же изменим режим работы процессора с «энергосбережение» на «производительность», что заставит процессор работать более эффективно.

1. Текущие состояние Turbo Boost и его смена.

Установим необходимый пакет

Проверим текущие состоние, где -p0 — номер ядра:

1 = деактивирован
0 = активирован

rdmsr:open: No such file or directory

Нужно загрузить модуль msr в ядро:

Далее можно правя регистры включать или отключать Turbo Boost, но чтобы было проще, я нашел скрипт, который активирует или деактивирует его, без запоминания сложных регистров. Назовем его turbo-boost.sh:

#!/bin/bash if [[ -z $(which rdmsr) ]]; then echo "msr-tools is not installed. Run 'sudo apt-get install msr-tools' to install it." >&2 exit 1 fi if [[ ! -z $1 && $1 != "enable" && $1 != "disable" ]]; then echo "Invalid argument: $1" >&2 echo "" echo "Usage: $(basename $0) [disable|enable]" exit 1 fi cores=$(cat /proc/cpuinfo | grep processor | awk '') for core in $cores; do if [[ $1 == "disable" ]]; then sudo wrmsr -p$ 0x1a0 0x4000850089 fi if [[ $1 == "enable" ]]; then sudo wrmsr -p$ 0x1a0 0x850089 fi state=$(sudo rdmsr -p$ 0x1a0 -f 38:38) if [[ $state -eq 1 ]]; then echo "core $: disabled" else echo "core $: enabled" fi done

Теперь вы можете активировать/деактивировать Turbo Boost:

./turbo-boost.sh disable ./turbo-boost.sh enable

2. Управление режимом питания процессора, если используется intel_pstate:

Установим утилиту cpupower:

apt install linux-cpupower

Узнать текущие состояние 1-го ядра:

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

Возможные варианты: https://www.kernel.org/doc/Documentation/cpu-freq/governors.txt.

Нас интересует режим performance, так как он дает наибольшую производительность. У вас возможно стоит powersave, как было у меня, поэтому сменим его.

cpupower frequency-set -g performance

На этом все, мы включили Turbo Boost и переключили режим работы процессора на максимальную производительность, так как нам нет смысла экономить электроэнергию на арендованом сервере в Дата Центре.

Еще дам команду, с помощью которой можно наблюдать за изменением частоты ядер процессора:

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

Игорь Горгуль

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