From past benchmarks of Spectre and Meltdown mitigations[1], we know that synchronization primitives and context switches were especially impacted. The same see

From past benchmarks of Spectre and Meltdown mitigations[1], we know that synchronization primitives and context switches were especially impacted. The same seems to be the case here, so I'd expect RDBMS to be heavily affected unless they attempt to specifically circumvent the deactivation. Curiously, postgres seems to perform okay (<10% drop) two years after the initial mitigations - perhaps due to newer versions of kernel-level fixes having less of a performance impact. [edit] According to phoronix, the small penalty is mostly due to hardware-based mitigations in newer architectures. [1] https://www.phoronix.com/scan.php?page=article&item=spectre-meltdown-2&num=9 https://www.phoronix.com/scan.php?page=article&item=spectre-...