# Measuring the noise in Performance tests

DevFeed: [Measuring the noise in Performance tests](<https://devfeed.tech/articles/measuring-the-noise-in-performance-tests-20257.md>)

Original publisher: [Read original article](<https://elvis314.wordpress.com/2017/11/16/measuring-the-noise-in-performance-tests/>)

Author: elvis314

Published: 2017-11-16T20:20:19Z

Content type: article

Language: en

Sources: [Mozilla Automation](<https://devfeed.tech/sources/mozilla-automation.md>)

Topics: [Hardware](<https://devfeed.tech/topics/hardware.md>), [data](<https://devfeed.tech/topics/data.md>)

Tags: [hardware](<https://devfeed.tech/tags/hardware.md>), [metrics](<https://devfeed.tech/tags/metrics.md>), [performance](<https://devfeed.tech/tags/performance.md>), [testdev](<https://devfeed.tech/tags/testdev.md>), [tests](<https://devfeed.tech/tags/tests.md>), [tools](<https://devfeed.tech/tags/tools.md>)

## AI overview

The article examines noise in Talos performance-test results, defining it as greater standard deviation and explaining how it can obscure regressions, trigger false alerts, and affect hardware evaluation. It describes using repeated data points, comparison views, and variance calculations to assess reliability when introducing new hardware.

## Source excerpt

Often I hear about our talos results, why are they so noisy? What is noise in this context- by noise we are referring to a larger stddev in the results we track, here would be an example: With the large ... Continue reading ->