Performance Config

Power Policy

Indicates the energy-saving mode of the server. The options are as follows:

• 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.

Efficiency

DEMT

Selects a Dynamic Energy Management Technology (DEMT) mode.

In fast mode, the frequency modulation speed is fast. Once the CPU load increases to 90% or above, the CPU immediately runs at the highest frequency. Once the CPU load drops to less than 90%, the CPU immediately runs at the lowest frequency.

In smooth mode, the frequency modulation speed is slow. When the CPU load increases to 90% or above, the CPU smoothly runs to the highest frequency. When the CPU load drops to less than 90%, the CPU smoothly runs to the lowest frequency.

The options are as follows:

• Disable: disables DEMT.
• Fast Mode
• Smooth Mode

Disable

Cache Mode

Selects an optimized cache mode. You are advised to use the default value. The options are as follows:

• in: partition out: share
• in: share out: share
• in: private out: share
• in: private out: private

in: partition out: share

Stream Write Mode

Specifies the data write path after the stream write feature is triggered. The options are as follows:

• Disabled: disables the stream write feature.
• Allocate LLC: writes data to the local LLC.
• Enable bypassLLC: enables bypass LLC and writes data to the DDR.
• Allocate share LLC: writes data to the share LLC.

Allocate share LLC

Stream Write VALUE

Specifies the threshold for triggering the stream write feature. The options are as follows:

• threshold: 12 lines
• threshold: 64 lines
• threshold: 512 lines

threshold: 12 lines

HHA SpecConfig Mode

Configures the speculative read waterline: HHA speculative read brings benefits to applications with less inter-cache communication. However, in HPC scenarios, inter-cache communication is frequent, and the bandwidth of memory-bound applications is large. HHA speculative read brings few benefits and occupies bandwidth, deteriorating application performance. The options are as follows:

• Enabled
• Disabled

Enabled

Performance Profile

Sets the performance profile. The options are as follows:

• Custom
• High RAS
  NOTE:

  This parameter is supported by TaiShan 200 servers (2280, 5280, 2280VE, 5280VE, 2280VF, 2480, and 5290) and TaiShan 200 Pro servers (models 2480 and 2280).

Custom

SSBS Support

Enables or disables the SSBS instruction set. The options are as follows:

• Enabled
• Disabled
  NOTE:

  If SSBS Support is set to Enabled, the CPU performance decreases by approximately 6%.

Enabled