Spectre/Meltdown Performance Impact Across Eight Linux Distributions
While nearly all Linux distributions have been mitigated against the Spectre and Meltdown CPU vulnerabilities for over one year, the performance ahead associated with these speculative execution vulnerabilities can vary. This is especially more so with the enterprise Linux distributions that are generally shipping on older kernel branches prior to where the initial kernel support was mainlined. With recent kernel releases we've also seen varying optimizations and other changes around the Spectre/Meltdown/L1TF mitigations. So for those wondering about the varying impact, here are some side-by-side benchmarks.
For those curious how the Spectre/Meltdown mitigation impact can vary between Linux distributions, on the same system I tested eight different Linux distributions while comparing the default mitigation costs to that of disabling all possible Spectre/Meltdown/L1TF mitigations that can be run-time disabled. The same up-to-date microcode of the BIOS/firmware was maintained the same with primarily going to the extents an end-user would if wanting to try to recover the performance costs involved with Spectre/Meltdown on each of the tested Linux distributions.
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