On the main application form you can observe Performance control indicator which will show two states Speed Shift or Legacy. While Speed Shift is relying on the CPU hardware, it still takes performance hints (performance settings) which includes minimum, maximum and desired performance limits from the operating system or the user in order to maintain specific level of system responsiveness. However, if it's not enabled by the OS or the BIOS and still supported by the CPU itself, the application can manually enable Speed Shift feature which will be disabled again on system restart or deep sleep. If Speed Shift is enabled by default on the BIOS or OS kernel level it cannot be turned off by the application. NOTE: Currently user defined Speed Shift settings will be reset back to the default on system restart or deep sleep. With Speed Shift enabled, CPU takes over the responsibility of frequency control, which will be done on a hardware level by the CPU itself, this’ll allow much faster p-state transitions and can drastically reduce latency during the process of p-state selection. Starting with CPU codename Skylake, the problem with performance control adjustment was addressed with Speed Shift (Hardware Controlled Performance) also known as Intel HWP (Hardware p-states).
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However, this will can reduce the battery life for portable devices, increase power consumption, and thermal output. One can certainly avoid this problem altogether by selecting for instance, maximum performance. The problem with this approach is the level of latency that is added to the performance adjustment process, which slightly reduces overall performance as a result. In order to receive performance hints (p-states) and adjust performance according to the operating system, application or user needs, processors prior to Skylake model are relying on the operating system. Intel Speed Shift technology also known as HWP (Hardware p-state) or Hardware Controlled Performance delivers quicker responsiveness with short duration performance shifts, by allowing the processor to more quickly select its best operating frequency and voltage for optimal performance and power efficiency.įor performance, efficiency and power consumption reasons, modern processors are constantly changing clock frequency and voltage based on the workload.
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