Arch Linux

virtuemood

Member

Registered: 2009-04-04

Posts: 33

turbo boost not working

I have a acer 1830t laptop with a i5 430um cpu.
And turbo boost work perfectly on windows.

The cpu can reache 1.73 Ghz in turbo boost mode.
The problem is that I can never achieve it.

-
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
1200000 1199000 1066000 933000 799000 666000
-
-
cat /sys/devices/system/cpu/cpu0/cpufreq/bios_limit
1200000
-

It seems that the maximum frequency is limit to 1.2 Ghz by bios.
But there isn't any option in the bios regarding cpu frequency.

Last edited by virtuemood (2010-11-27 17:55:44)

thestinger

Package Maintainer (PM)

From: Toronto, Canada

Registered: 2010-01-23

Posts: 478

Re: turbo boost not working

Turbo isn't done in software, so it's unrelated to cpufreq. It will also only turn on when there are unused cores.

How are you measuring the current frequency?

Also, what cpufreq governor are you using (and what is the up_threshold set to) - cpufreq isn't responsible for turning on turbo, but it could be stopping it having the chance to turn on.

Last edited by thestinger (2010-11-27 18:08:55)

virtuemood

Member

Registered: 2009-04-04

Posts: 33

Re: turbo boost not working

I use performance cpu governor

I get the current speed by
    cat /proc/cpuinfo | grep -i MHz

With acpi_cpufreq module loaded
   cpu MHz        : 1200.000
Once I unload acpi_cpufreq module , I get
   cpu MHz        : 1197.000

Last edited by virtuemood (2010-11-27 18:15:49)

thestinger

Package Maintainer (PM)

From: Toronto, Canada

Registered: 2010-01-23

Posts: 478

Re: turbo boost not working

I don't think /proc/cpuinfo will show turbo, try this.

virtuemood

Member

Registered: 2009-04-04

Posts: 33

Re: turbo boost not working

/proc/cpuinfo:
  cpu MHz        : 1200.000

----------------------------------------------------------------------------------------------------------------
i7z:

  Cpu speed from cpuinfo 1197.00Mhz
cpuinfo might be wrong if cpufreq is enabled. To guess correctly try estimating via tsc
Linux's inbuilt cpu_khz code emulated now
True Frequency (without accounting Turbo) 1197 MHz
  CPU Multiplier 9x || Bus clock frequency (BCLK) 133.00 MHz

Socket [0] - [physical cores=2, logical cores=4, max online cores ever=2]
  TURBO ENABLED on 2 Cores, Hyper Threading ON
  True Frequency 1330.00 MHz (133.00 x [10])
  Max TURBO Multiplier (if Enabled) with 1/2/3/4 Cores is  13x/11x/0x/0x
  Max TURBO Multiplier (if Enabled) with 1/2/3/4 Cores is  13x/11x/0x/0x
  Current Frequency 812.06 MHz (Max of below)
        Core [core-id]  :Actual Freq (Mult.)      C0%   Halt(C1)%  C3 %   C6 %  Temp(in *C)
        Core 1 [0]:       812.06 (6.11x)        8.92    8.22    16.4    69.3    50
        Core 2 [2]:       738.16 (5.55x)        11.8    13.4    10.5    68.8    48

C0 = Processor running without halting