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Is It Worthwhile Running Intel Alder Lake With mitigations=off?

Submitted by Rianne Schestowitz on Thursday 2nd of December 2021 03:05:04 PM Filed under
Graphics/Benchmarks


Over the past month of trying out Intel Alder Lake processors on Linux, one of the questions that has come up a few times but not readily disclosed is whether it's still worthwhile on this latest-generation process to boot with "mitigations=off" to disable CPU security mitigations to help squeeze out some otherwise lost performance. Here are some benchmarks to answer that questions.

Particularly with Intel CPUs from 2018 and prior where there isn't in-silicon changes for mitigating the likes of Spectre and Meltdown, some Linux users have resorted to running with "mitigations=off" to run the security risk but at increased (or otherwise regressed) performance. This Linux parameter allows booting the system with software-controlled CPU security mitigations disabled. Running with mitigations disabled is a security risk but for prior generations of Intel CPUs can make a measurable difference with workloads that are heavy on context switching, I/O, and other areas impacted by the software mitigations.

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