Re: 2.6.2: P4 ClockMod speed

[dual_bereta_r0x]

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.

--
dual_bereta_r0x -- Alexandre Hautequest
ArenaNetwork Lan House & Cyber -- www.arenanetwork.com.br

Três anéis para os Reis Élficos sob este céu,
   Sete para os Senhores-Anões em seus rochosos corredores,
Nove para Homens Mortais, fadados ao eternos sono,
   Um para o Senhor do Escuro em seu escuro trono
Na Terra de Mordor onde as Sombras se deitam.
   Um Anel para a todos governar, Um Anel para encontrá-los,
   Um Anel para a todos trazer e na escuridão aprisioná-los
Na Terra de Mordor onde as Sombras se deitam.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/