---
name: "rtla-osnoise"
section: "1"
platform: "linux"
package: "rtla"
version: "6.12.107-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/rtla-osnoise"
---

# rtla-osnoise(1)

Measure the operating system noise

## NAME

rtla-osnoise - Measure the operating system noise

## SYNOPSIS

**rtla osnoise** \[*MODE*\] ...

## DESCRIPTION

The **rtla osnoise** tool is an interface for the *osnoise* tracer. The *osnoise* tracer dispatches a kernel thread per-cpu. These threads read the time in a loop while with preemption, softirq and IRQs enabled, thus allowing all the sources of operating system noise during its execution. The *osnoise*'s tracer threads take note of the delta between each time read, along with an interference counter of all sources of interference. At the end of each period, the *osnoise* tracer displays a summary of the results.

The *osnoise* tracer outputs information in two ways. It periodically prints a summary of the noise of the operating system, including the counters of the occurrence of the source of interference. It also provides information for each noise via the **osnoise:** tracepoints. The **rtla osnoise top** mode displays information about the periodic summary from the *osnoise* tracer. The **rtla osnoise hist** mode displays information about the noise using the **osnoise:** tracepoints. For further details, please refer to the respective man page.

## MODES

**top**

Prints the summary from osnoise tracer.

**hist**

Prints a histogram of osnoise samples.

If no MODE is given, the top mode is called, passing the arguments.

## OPTIONS

- **-h**, **--help**

  Display the help text.

For other options, see the man page for the corresponding mode.

## SEE ALSO

[**rtla-osnoise-top**(1)](/rtla-osnoise-top/1.md), [**rtla-osnoise-hist**(1)](/rtla-osnoise-hist/1.md)

Osnoise tracer documentation: \< \<https://www.kernel.org/doc/html/latest/trace/osnoise-tracer.html\> \>

## AUTHOR

Written by Daniel Bristot de Oliveira \< \<bristot@kernel.org\> \>

## REPORTING BUGS

Report bugs to \< \<linux-kernel@vger.kernel.org\> \> and \< \<linux-trace-devel@vger.kernel.org\> \>

## LICENSE

**rtla** is Free Software licensed under the GNU GPLv2

## COPYING

Copyright (C) 2021 Red Hat, Inc. Free use of this software is granted under the terms of the GNU Public License (GPL).