Re: 2.6.2: P4 ClockMod speed

[dual_bereta_r0x <dual_bereta_r0x@arenanetwork.com.br>]

Dominik Brodowski wrote:
> Hi,
> 
> 
>>I have a P4 2.4 running @ 3.12GHz.
> 
> 
> So you overclock your CPU but then throttle it down... strange, but well...

Actually it isn't throttled down, only sysfs is showing it with low 
speed. It *is* running @ 3.12 (or /proc/cpuinfo and boot messages are 
lying to me) when in full power.

>>In 2.6.0, i could change it frequency 
>>via speedfreqd(8) up to its actual speed. Since 2.6.1, its max speed is 
>>locked on cpu *real* speed.
> 
> 
> It's just a change of appearance -- the cpufreq driver uses the theoretical
> speed of the CPU for its calculations; the actual CPU speed isn't
> affected. You can verify this by looking at /proc/cpuinfo which still tells
> 3124.376 MHz.
> 
> By doing so it becomes easier to enter different frequencies e.g. into
> /sys/devices/system/cpu/cpufreq/scaling_setspeed -- on my desktop, typing in
> 1200000 is easier than 12121224... [*]

Sure but if i want to downgrade it, for example, by night, to a lower 
speed, and then next day return it to full power? Will I stuck at 2.4GHz?

> 	Dominik
> 
> [*] The _actual_ CPU speed should be used on all cpufreq drivers where this
> specific CPU frequency has implications to external components, e.g. LCD,
> memory or pcmcia devices. Where only the _frequency ratio_ is of importance
> [for loops_per_jiffy and friends] such "rounding" is acceptable, as long as
> the ratio is constant.

Indeed. I'll showing in LCD a lower speed than the running.

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