SPEC CPU2017 Platform Settings for New_H3C AMD-based 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: (Default="Auto"):
This option allows the user to choose between an Auto and Manual mode for Determinism Control. Values for this BIOS option can be.
Global C-states Control: (Default="Disabled"):
Controls IO based C-state generation and DF C-states.Values for this BIOS setting can be.
cTDP Control: (Default="Auto"):
Auto = Use the fused cTDP Manual = User can set customized cTDP.
cTDP is the acronym for Configurable TDP. Some Rome CPU skus support a default TDP and a higher cTDP expressed in Watts. Model Normal TDP Minimum cTDP Maximum cTDP EPYC 7H12 280 225 280 EPYC 7742 225 225 240 EPYC 7702 200 165 200 EPYC 7702P 200 165 200 EPYC 7662 225 225 240 EPYC 7642 225 225 240 EPYC 7502 180 165 200 EPYC 7502P 180 165 200 EPYC 7542 225 225 240 EPYC 7402 180 165 200 EPYC 7402P 180 165 200 EPYC 7302 155 155 180 EPYC 7302P 155 155 180 EPYC 7252 120 120 150
NUMA nodes per socket: (Default="Auto"):
Specifies the number of desired NUMA nodes per socket. Zero will attempt to interleave the two sockets together.
APBDIS: (Default="Auto"):
Values for this BIOS setting can be.
Soc P-States: (Default="P0"):
Values for this BIOS setting can be.
Package Power Limit Control: (Default="Auto"):
This is a per Processor Power Limit value applicable for all populated processors in the system. This can be set to limit the processor power to a certain value. Values for this BIOS option can be.
Memory Speed:
Select the desired memory speed. Faster speeds offer better performance but consume more power.