Processors

Description

View the summary of the installed processors.

Enabling turbo mode can boost the overall CPU performance when all CPU cores are not being fully utilized. A CPU core can run above its rated frequency for a short period of time when it is in turbo mode.

When a preset mode is selected, the low-level setting are not changeable and will be grayed out. To change the settings, select Choose Operating Mode > Custom Mode.

Select a method to control CPU P-states (performance states).

• None: disables all P-states and the CPUs run at either their rated frequency or in turbo mode (if turbo is enabled).

• Legacy: the CPU P-states will be presented to the operating system (OS) and the OS power management (OSPM) will directly control which P-state is selected.

• Autonomous: the P-states are controlled fully by system hardware. No P-state support is required in the OS or VM.

• Cooperative: a combination of Legacy and Autonomous. The P-states are still controlled in hardware but the OS can provide hints to the hardware for P-state limits and the desired setting.

When a preset mode is selected, the low-level setting are not changeable and will be grayed out. To change the settings, select Choose Operating Mode > Custom Mode.

C-states reduce CPU idle power.

• Legacy: the operating system initiates the C-state transitions. For E5/E7 CPUs, ACPI C1/C2/C3 map to Intel C1/C3/C6. For 6500/7500 CPUs, ACPI C1/C3 map to Intel C1/C3 (ACPI C2 is not available). Some OS SW may defeat the ACPI mapping (e.g. intel_idle driver).

• Autonomous: HALT and C1 request get converted to C6 requests in hardware.

When a preset mode is selected, the low-level setting are not changeable and will be grayed out. To change the settings, select Choose Operating Mode > Custom Mode.

Enabling C1E (C1 Enhanced) state saves power by halting CPU cores that are idle. An operating system that supports C1E state must be installed to take advantage of this feature. Setting changes will be taken effect after the next reboot.

Enable Intel Trusted Execution Technology (Intel TXT).

Enable the Virtualization Technology.

Lightly threaded applications and some benchmarks can benefit from having the hardware prefetcher enabled.

Lightly threaded applications and some benchmarks can benefit from having the adjacent cache line prefetch enabled.

Lightly threaded applications and some benchmarks can benefit from having the DCU streamer prefetcher enabled.

It is recommended that DCU IP prefetcher is set as Enable for most environments. However, some environments may benefit from having it set as Disable, e.g. Java.

• Enable: the CPU’s optimal turbo frequency will be tuned dynamically based on CPU utilization.

The power/performance bias setting also influences energy efficient turbo.

• Enable: the CPU uncore will dynamically change speed based on the workload. All miscellaneous logic inside the CPU package is considered to be the uncore.

SNC (sub NUMA cluster) partitions the cores and the last level cache into clusters with each cluster bound to a set of memory controllers in the system. SNC improves average latency to the last level cache.

Select the appropriate snoop mode based on the workload.

However, the snoop mode preference may be changed if the current hardware configuration does not support the desired mode. Also not that SNC has priority over the snoop mode.

Select the amount of cores enabled within each CPU Package.

The options will be the maximum number of cores that the installed processor supports. For example, if 6 cores are supported, there will be All, 1, 2, 3 4, and 5.

The maximum frequency (turbo, AVX, and non turbo) can be restricted to a frequency that is between the maximum turbo frequency for the CPU installed and 1.2GHz. This can be useful for synchronizing CPU tasks.