Using the CPU hot-plugging functionality to disable one of a pair of sibling threads. This is the method I recommend.Īt boot time using the kernel command line parameter nosmt.Īt runtime using SMT Control: echo off > /sys/devices/system/cpu/smt/control In your system’s UEFI or BIOS firmware settings. There are multiple methods to disable SMT / HT: Disabling HT / SMT has the additional benefit of doubling (in case ofĢ-way SMT) the effective L1 and L2 cache available to a thread. Turn it off if you want to reduce jitter introduced by contention on processor

Since HT/SMT increases contention on processor resources it’s recommended to Is a technology to maximize processor resource usage for workloads with low The systems UEFI or BIOS usually have a setting for energy profile that adjustsĪvailable CPU power states, you should set this to “maximum performance” or In this example it shows how coreģ was isolated and experienced a maximum jitter of 18 us: $ hiccups | column -t -R 1,2,3,4,5,6Ĭpu threshold_ns hiccups pct99_ns pct999_ns max_nsĭiscussion on HN.

You can measure the reduced system jitter using my tool

Minimize jitter caused by interrupts, timers and other applications.

Maximize per core performance by maximizing CPU frequency and disabling.

To achieve low latency this guide describes how to:

The time between a request was submitted to a queue and the worker thread.

The time between a network packet was received by a NIC until an application.

The term latency in this context refers to the time between receiving some eventĪnd the time when the event was processed.

Applications using kernel-bypass networking.

Running real-time or low latency workloads. This guide describes how to tune your AMD64/x86_64 hardware and Linux system for

How to enable turbo boost on linux