AMD CPU Turbo Boost

sealanco · 2014-09-21 23:24:22

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.

This is my /proc/cpuinfo
http://sprunge.us/SKGT

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

mich41 · 2014-09-22 05:38:24

Maybe it's disabled by BIOS?

sealanco · 2014-09-22 08:36:08

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

desaparecido · 2014-09-24 10:35:16

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

using:

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.

sealanco · 2014-09-24 11:28:32

desaparecido:

I think that your Turbo Boost is working because you have 'Active: yes' whereas I have 'Active: no'
I don't know how to activate it....

'cpupower monitor' and 'powertop' never go beyond 1700MHz but I'm pretty sure my CPU supports Turbo Boost up to 2700MHz

How do I activate Turbo Boost?

desaparecido · 2014-09-25 11:29:20

@sealanco:
hi, I don't know your MB but in my ASUS MB I have Turbo Mode with: Always, Disable and auto, so is easier. I you don't have this option in your BIOS setup probably is needed a BIOS upgrade ? I'd read about your MB and effectivly is featured with Turbo Boost 2.7 GHz. sorry to can't help you

Arch Linux

#1 2014-09-21 23:24:22

AMD CPU Turbo Boost

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

Re: AMD CPU Turbo Boost

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

Re: AMD CPU Turbo Boost

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

Re: AMD CPU Turbo Boost

#5 2014-09-24 11:28:32

Re: AMD CPU Turbo Boost

#6 2014-09-25 11:29:20

Re: AMD CPU Turbo Boost

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