Hardware Tuning

Efficiency: indicates the energy-saving mode, which supports Collaborative Processor Performance Control (CPPC) dynamic frequency modulation.
Performance: indicates the performance mode. In this mode, no dynamic frequency modulation (FM) is available, and the operating frequency is fixed at the nominal frequency.

Configure advanced BIOS settings to improve server performance.

Table 1 shows the recommended BIOS configuration. For details about how to access the BIOS of Kunpeng servers, see "Accessing the BIOS" in TaiShan Server BIOS Parameter Reference (Kunpeng 920 Processor).

**Table 1** Recommended BIOS configuration
BIOS Option	Description	Recommended Value	Navigation Path
Power Policy	Sets the energy efficiency mode. Efficiency: indicates the energy-saving mode, which supports Collaborative Processor Performance Control (CPPC) dynamic frequency modulation. Performance: indicates the performance mode. In this mode, no dynamic frequency modulation (FM) is available, and the operating frequency is fixed at the nominal frequency.	Performance	BIOS > Advanced > Performance Config > Power Policy
Custom Refresh Rate	Sets the custom memory refresh rate.	64 ms	BIOS > Advanced > Memory Config > Custom Refresh Rate
Support Smmu	Enables or disables the SMMU function.	Disabled	BIOS > Advanced > MISC Config > Support Smmu
CPU Prefetching Configuration	Enables or disables CPU prefetching.	Enabled	BIOS > Advanced > MISC Config > CPU Prefetching Configuration

Parent topic: SPECjvm Tuning Guide (openEuler 22.03)