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The Current Spectre / Meltdown Mitigation Overhead Benchmarks On Linux 5.0

Submitted by Rianne Schestowitz on Monday 4th of March 2019 07:58:25 AM Filed under
Graphics/Benchmarks

With it being a little over one year since Spectre and Meltdown mitigations became public and with the Linux kernel today hitting the big "5.0" release, I decided to run some benchmarks of the current out-of-the-box performance hit as a result of the current default mitigation techniques employed by the Linux kernel. The default vs. unmitigated performance impact for Spectre/Meltdown are tested on an Intel Core i7 and Core i9 systems while there is also an AMD Ryzen 7 box for reference with its Spectre mitigation impact on Linux 5.0.

These tests are for reference purposes to see what the default/out-of-the-box performance cost is to Spectre/Meltdown on the Linux 5.0 kernel being released today. The near-final 5.0 Git snapshots were used for testing atop Ubuntu 18.10 on three different systems - the hardware is different in these systems in looking at their mitigated vs. unmitigated performance impact rather than looking at the raw CPU performance between systems.

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