SPEC CPU2017 Flag Description for Epsylon AMD Platform

Commands and Options Used to Submit Benchmark Runs

Shell, Environment, and Other Software Settings

ulimit -s <n>

Sets the stack size to n kbytes, or unlimited to allow the stack size to grow without limit.

Firmware / BIOS / Microcode Settings

Power phase shedding:

Power phase shedding allows efficiency optimization of the voltage regulator across the variety of loads, minimizing average energy consumption by optimizing the powertrain for specific load power states. Values for this BIOS option can be: Enabled/Disabled. Default is Enabled.

SVM Mode:

This is CPU virtualization function. With SVM enabled it will be possible to install a virtual machine on the system. Values for this BIOS option can be: Enabled/Disabled. Default is Enabled.

SR-IOV support:

In virtualization, single root input/output virtualization or SR-IOV is a specification that allows the isolation of the PCI Express resources for manageability and performance reasons. A single physical PCI Express can be shared on a virtual environment using the SR-IOV specification. If system has SR-IOV capable PCIe Devices, this option Enables or Disables Single Root IO Virtualization Support. Values for this BIOS option can be: Enabled/Disabled. Default is Enabled.

DRAM Scrub time:

DRAM scrubbing is a mechanism for the memory controller to periodically read all memory locations and write back corrected data. The time interval for scrubbing the entire memory can be: Disabled/1 hour/4 hours/8 hours/16 hours/24 hours/48 hours/Auto. Default is Auto (AGESA default value).

NUMA nodes per socket:

Specifies the number of desired NUMA nodes per populated socket in the system:

• NPS1: Each physical processor is a NUMA node, and memory accesses are interleaved across all memory channels directly connected to the physical processor.
• NPS2: Each physical processor is two NUMA nodes, and memory accesses are interleaved across 4 memory channels.
• NPS4: Each physical processor is four NUMA nodes, and memory accesses are interleaved across 2 memory channels.
• Auto: Use AGESA default value. Default is NPS1

Default is Auto.

Determinism Slider:

This BIOS option allows for AGESA determinism to control performance.

• Performance: Provides predictable performance across all processors of the same type.
• Power: Maximizes performance within the power limits defined by cTDP and PPT.
• Auto (Default setting): Use AGESA default value for deterministic performance control.