Re: CPU default frequency is at 75%
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Jochen Schulz <ml@well-adjusted.de> writes:
> Merciadri Luca:
>> Jochen Schulz <ml@well-adjusted.de> writes:
>>
>>> What does
>>>
>>> # cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
>>>
>>> say after bootup?
>>>
>> Ondemand, the same as what appears in the applet, after boot. However,
>> despite "Ondemand", even a huge CPU load does not make Debian asking
>> for more CPU resources, such as 100%.
>
> Then have a look at
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
>
> It should contain the highest frequency your processor supports.
It is the case.
>>> That would be the kernel's default behaviour if your
>>> current governor is either ondemand or conservative.
>>>
>> How could I modify it?
>
> Modify what? -Most probably, cpufrequtils will contain all the tools
> you need. It allows you to select a governor and set min/max frequency
> limits, for cases where they are mis-reported by default.
>
>>> I suggest you use just the ondemand governor and stop caring about the
>>> issue at all. You will get full CPU power when you need it and save a
>>> little power when you don't.
>>
>> My aim is not to save power. I am running many scientific-purpose
>> applications, and they need full CPU power.
>
> Sure, no problem. The ondemand governor is all about saving power
> without sacrificing performance. If nothing's wrong with your
> configuration, this is exactly what you should get by default.
Something must be wrong, as CPU freq. is never modified, even with
there is a huge load.
> A question that comes to my mind: how do you measure the current clock
> frequency? Only by looking at the Gnome applet?
On one hand, by looking at the GNOME applet. On the other hand, by
hearing fans, which are really noisy when I use "Performance" rather
than "Ondemand".
> I would take a look into
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq, just to be
> sure.
It exactly gives the same values as GNOME's applet does.
- --
Merciadri Luca
See http://www.student.montefiore.ulg.ac.be/~merciadri/
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