Intel® Ethernet 800 Series

Linux Performance Tuning Guide

ID Date Version Classification
636781 10/23/2023 Public
Document Table of Contents

​CPU Frequency Scaling

CPU frequency scaling (or CPU speed scaling) is a Linux power management technique in which the system clock speed is adjusted on the fly to save power and heat. Just like C-states, this can cause unwanted latency on network connections.

  • ​​The cpupower tool can also be used to check and modify CPU performance defaults and limits:

    Check: cpupower monitor or cpupower frequency-info

    Set CPUs to performance mode: cpupower frequency-set -g performance

Note:​Modifications to CPU frequency limits can have an impact to many workloads and might disable other features, like CPU turbo mode.