No te agites tanto, descanza: Mejorando AMD Cool & Quiet

[Trastaro]

Ya muchos ya deben conocer el sistema Cool & Quiet de AMD el cual consiste en poner a descanzar los nucleos del procesador Phenom cuando no hay mucho trabajo y reanimarlos cuando hay tareas pesadas, para esto baja o sube las frecuencias de trabajo de cada nucleo segun se necesite de manera automatica logrando un ahorro de energia y menos calor. Y esta funcion la realiza mediante la asignacion de estados que son 2 en los Phenom y 4 en los Phenom II.

Al parecer el sistema no se lleva muy bien con el OC o en algunos sistemas como WinXP por lo que desde hace semanas programadores de software libre han sacado su version mejorada que segun dicen si funciona incluso mejor que el original.

PhenomMsrTweaker: Herramienta que permite personalizar 2 de los 4 estados que permite cambiar la frecuencia de trabajo, el voltaje del nucleo y el multiplicador para cada nucleo del procesador Phenom que este presente. De esta manera tienes control sobre el estado "a galope" o de maximo rendimiento -velocidad maxima- y el estado de "a trote" o de ahorro de energia -velocidad minima-. Ideal paar estos dias calurosos en donde un poco de ayuda no cae nada mal y tambien ahorra algo de dinero en la cuenta del consumo electrico que se incrementa con la adicion de 3 o 4 nucleos.

Iniciado por Martin Kinkelin

System requirements

* AMD K10 CPU (Phenom, Phenom II, Athlon X2 6500 and 7750...)
* Windows XP+ 32/64 bit, .NET Framework v2.0+

Some background infos
What about these P-states?

Each core of a K10 CPU may run in one of up to 5 performance states (P-states). P0 is the highest-performing (default) state, the others ascend to the max-powersaving state. Phenom CPUs use only 2 states, P0 (high performance) and P1 (powersaving). Phenom II CPUs specify 4 states, P0 to P3.

Each core boots in the P0 state. If Cool & Quiet is enabled, a driver may put a core later in a powersaving state if its load is low and then back to a higher-performing state when its load increases.

Each one of these per-core P-states consists in:

* a multiplicator controlling the clock frequency (4x to max. multi),
* a voltage ID for the CPU core (0 to 1.55V), and
* a voltage ID for the integrated Northbridge/memory controller (0 to 1.55V).

PhenomMsrTweaker allows you to customize these settings for all cores and the first two P-states, P0 and P1. Therefore you may choose your optimal settings for P0 (overclocked state) and P1 (undervolted state).
What about Cool & Quiet?

Cool & Quiet (C&Q) consists in offering a driver full control over the CPU core P-states. So a driver may switch between a core's performance states based on its current load, saving power when the CPU idles.

This is a good thing, but has 2 disadvantages:

*

It decreases system stability if not all P-states are configurable in your BIOS.

If you overclock the Northbridge and/or the HT reference clock, you'll probably need higher voltages. But since most BIOS versions do not allow to customize P-states above P0, they select default voltages which may cause the system to crash as soon as all cores are in a powersaving state - and this might already occur during Windows startup.
*

It doesn't work too well.

Firstly, more than 2 P-states are not really useful in my opinion. Switching between a state may take up to 1 ms, or roughly 1 million clock cycles. So frequent switching should be avoided.

Secondly, the concept of individual P-states per core is not that useful.
o All cores receive the same voltage, which is the voltage specified by the core in the highest-performing state. Since voltage has much stronger influence on the consumed energy than clock frequency, switching to a higher state only really makes sense if all cores are idling.
o Windows re-assigns threads from one core to the other, unless a certain affinity is specified. So if a single-threaded application requires all available computation power, it may be assigned to different cores over time. All cores may need to be put in the P0 state while they are processing the thread. So this thread-hopping across cores results in frequent P-state switching and lower performance.

These 2 disadvantages are remedied by using the PhenomMsrTweaker service. It allows to automatically apply custom P-state settings when Windows is starting/resuming and to use a configurable C&Q replacement which uses only P0 and P1 and keeps all cores' P-state in sync.

Replacing standard C&Q by custom C&Q may improve the run-time of single-threaded applications by more than 20% (Super PI mod 1.5 XS 1M test: 32.43 secs vs. 25.88 on my machine). Only Phenom II CPUs on Vista+ seem to use a pretty well-working standard implementation - but feel free to perform your own benches.

Bajar: http://phenommsrtweake.sourceforge.net/


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[Trastaro]

No lo habia visto, pero tambien hay una version del PhenomMSRTweaker para los procesadores Brazo y LLano su nombre: FusionTweaker.

Las funciones y configuracion de FusionTweaker [LlanoTweaker y BrazosTweaker] son similares y tambien esta disponible en version de 32bit y 64bit para Windows XP/VISTA/7




El anterior


Pagina oficial: http://code.google.com/p/fusiontweak...eFusionTweaker
http://code.google.com/p/fusiontweaker/

http://code.google.com/p/brazostweaker/

[Trastaro]

Por suerte el creador de estas herramientas Sven Wittek dara soporte tambien a las APUs trinity y puede tambien a los FX -ambos usan arquitectura BullDozer aunqye de diferente revision-.

Iniciado por ="Sven Wittek"

Basically I was using a tool, RMClock in the past to fine tune and monitor the temperatures of my older desktop CPUs. Sometime ago, I got a laptop with an AMD Phenom CPU. I wanted to reduce the temperatures and increase battery life. Since RMClock was not available for AMD Phenom any more, I was looking for an alternative. I found a tool called PhenomMsrTweaker, which I really liked after a while for its usability and the built-in service. The same tool is running on my desktop now and I’m very pleased with it.

A little later in April 2011, I bought a netbook with an E-350 APU. I liked this netbook a lot and I was looking for further improvements in battery life with lower temperatures, but there was no tool yet to do that in an easy way.

Because I already knew that the PhenomMsrTweaker tool is OpenSource code, I decided to try my luck and get the PhenomMsrTweaker adjusted to fit the Brazos platform. I was really inexperienced in the programming languages that it used (CSharp and C++ combined) and the details of how to control the processor registers. With the help of programming books, the BIOS developer guide from AMD, and a lot of my free-time I finally got an initial program, which was almost fully working. The first versions were still called PhenomMsrTweaker, but sometime later I found Google Code and started the BrazosTweaker project there. I made some posts in German and US forums to get some feedback, and people found the program quite handy.

After that, a few people started to ask if I could try to get the same done for Llano APUs. Since I haven’t got a Llano system, I tried to adjust the program blindly and let other people give it a shot, while using their feedback to wipe out bugs. Unfortunately that didn’t work out too well. The first versions of FusionTweaker were only partly working. Luckily in September, I had the chance to get my hands on a Llano notebook for a while to fix bugs. Now the released version is much more stable, but it still has some minor issues.

A few weeks ago, I started to work on merging BrazosTweaker and FusionTweaker into one. I’m doing this, because that’s the only way to maintain the code in the future. Once I’m done, I’ll have just one program to focus on and then I can easily add new designs (i.e. Bulldozer, Trinity). It should also make it possible to add functions that users have already have asked for.

http://semiaccurate.com/2012/01/09/s...brazostweaker/