AMD Zen 1 Linux Performance Hit From Retbleed, Accumulated CPU Mitigation Impact

The OpenJDK Java performance is impacted by these mitigations but when disabling SMT is another case where the performance can come out ahead due to not having two threads sharing a core.

Code compilation workloads have been minimally impacted by Retbleed and the other CPU security mitigations affecting AMD Zen 1 processors. Well, for the default state. If going for full protection and disabling SMT, this is one of the areas where the performance certainly hurts if compiling large code-bases and using parallel jobs.