Tuning UEFI Settings for Performance and Energy Efficiency on Lenovo ThinkSystem SR635 and SR655 ServersPlanning / Implementation

7 Mar 2020
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22 pages, 206 KB


Properly configuring UEFI parameters in a server is important for achieving a desired outcome such as maximum performance or maximum energy efficiency. This paper defines preset UEFI operating modes for Lenovo® ThinkSystem™ servers running second-generation AMD EPYC processors that are optimized for each of these outcomes. In addition, a thorough explanation is provided for each of the UEFI parameters so they can be fine-tuned for any particular customer deployment.

This paper is for customers and for business partners and sellers wishing to understand how to optimize UEFI parameters to achieve maximum performance or energy efficiency of Lenovo ThinkSystem servers with second-generation AMD EPYC processors.

Table of Contents

Summary of operating modes
Operating mode
Core performance boost
SMT mode
Global C-State Control
Determinism slider
Configurable TDP control
PPL (Package Power Limit)
L1 and L2 Stream Processor Prefetchers
Memory speed
Memory interleaving
Chipselect Interleaving (Bank Interleaving)
NUMA nodes per socket
LLC as NUMA node
CPU Cores Activated (Downcore)
Preferred I/O bus
SVM Mode (AMD Virtualization Technology)
ThinkSystem SR635 and SR655 platform design

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