SPEC CPU2017 Platform Settings for Lenovo Systems

Operating System Tuning Parameters

This OS setting controls the amount of run-time(bandwidth) transferred to a run queue from the task's control group bandwidth pool. Small values allow the global bandwidth to be shared in a fine-grained manner among tasks, larger values reduce transfer overhead. The default value is 5000 (ns).
This OS setting configures targeted preemption latency for CPU bound tasks. The default value is 24000000 (ns).
Amount of time after the last execution that a task is considered to be "cache hot" in migration decisions. A "hot" task is less likely to be migrated to another CPU, so increasing this variable reduces task migrations. The default value is 500000 (ns).
This OS setting controls the minimal preemption granularity for CPU bound tasks. As the number of runnable tasks increases, CFS(Complete Fair Scheduler), the scheduler of the Linux kernel, decreases the timeslices of tasks. If the number of runnable tasks exceeds sched_latency_ns/sched_min_granularity_ns, the timeslice becomes number_of_running_tasks * sched_min_granularity_ns. The default value is 8000000 (ns).
This OS setting controls the wake-up preemption granularity. Increasing this variable reduces wake-up preemption, reducing disturbance of compute bound tasks. Lowering it improves wake-up latency and throughput for latency critical tasks, particularly when a short duty cycle load component must compete with CPU bound components. The default value is 10000000 (ns).
This OS setting controls automatic NUMA balancing on memory mapping and process placement. Setting 0 disables this feature. It is enabled by default (1).

Firmware / BIOS / Microcode Settings

Set Operating Mode: (Default="Maximum Efficiency")
Select the operating mode based on your preference. Note, power savings and performance are also highly dependent on hardware and software running on system.
Determinism Slider:
Auto = Use default performance determinism settings Power Performance.
Global C-state Control:
Controls IO based C-state generation and DF C-states.
cTDP Control:
Auto = Use the fused cTDP Manual = User can set customized cTDP.
Memory Speed:
Select the desired memory speed. Faster speeds offer better performance but consume more power.
NUMA nodes per socket:
Specifies the number of desired NUMA nodes per socket. Zero will attempt to interleave the two sockets together.
Package Power Limit Control:
Auto = Use the fused PPT\nManual = User can set customized PPT\n***PPT will be used as the ASIC power limit***
SMT Mode:
Can be used to disable symmetric multithreading. To re-enable SMT, a POWER CYCLE is needed after selecting the 'Auto' option. WARNING - S3 is NOT SUPPORTED on systems where SMT is disabled.
CCD Control:
Sets the number of CCDs to be used. Once this option has been used to remove any CCDs, a POWER CYCLE is required in order for future selections to take effect.
0 = use performance optimized CCLK DPM settings\n1 = use power efficiency optimized CCLK DPM settings
LCC as NUMA Node:
Exposes the processor's last level caches as NUMA nodes. When enabled, can improve performance for highly NUMA optimized workloads if workloads or components of workloads can be pinned into the caches.