And I need to know the frequency as accuracy as possible due to real time purposes. On the other hand, I do not sure that the ratio provided by APERF/MPERF division is really of the frequency. But I would like to use last method because it involve less time to know the ratio. I trust more in tsc than in aperf/mperf ratio.
A) get the time that a well-defined loop take to complete at different frequencies, and B) use IA32_MPERF MSR and IA32_APERF MSR (Chap 13, page 13-2) which division is the ratio of the processor frequency.īut I find significant differencies between both methods and the theoretical values (show in table below). And two ways to get the real working-frequency. There is a table whit the theoretical values in the specification vol 3A Chap 13 page 13-16. Then, I have a set of fixed dutycycle values. It allows to me to modulate the dutycycle of the on-demand clock. I use IA32_CLOCK_MODULATION MSR to change the CPU frecuency. This app will be helpful to almost any type of user, and the presets will help the more novice get a handle on performance without much risk of harming their machine.I am working with MaRTE OS (a Hard RTOS with a Minimal RT POSIX.13 subset ) and at a low level programing. The author's site goes into full detail about several of the functions available. Quick CPU's interface is organized even with the massive amount of data and available fine-tuning options it contains. From there, you can either accept or discard them. Before the changes are applied, you are given a popup notification that outlines the changes. You can manually perform all the included options or choose from the three preset performance modes Minimum, Balanced, or Maximum. With Quick CPU, you can view and modify your CPU Temperature (Package and Core Temp), CPU Performance, Power, Voltage, Current, Core Parking, Frequency Scaling, System Memory, Turbo Boost, C-States, Speed Shift FIVR Control, as well as making other adjustments on the fly. Quick CPU enables fine-tuning and monitoring of essential CPU and system parameters.
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