AMD Ryzen 9 3950X Performance Impact From Retbleed Mitigations

Following the July disclosure of the Retbleed CPU security vulnerability affecting older processors and an AMD change made in August, here is a fresh look at the performance impact of the Retbleed mitigations on Linux, including if opting for the IBPB-based Retbleed mitigation, and the accumulated CPU security mitigation impact for Zen 2 with the flagship Ryzen 9 3950X processor.

Being curious about the Retbleed performance impact for the Ryzen 9 3950X following my earlier Zen 1 testing as well as Intel Skylake testing, I ran some benchmarks looking at the AMD Ryzen 9 3950X in different mitigation states with the latest kernel code. As a reminder, Retbleed on the AMD side affects only Zen 2 CPUs and older -- not current generation Zen 3 or the upcoming Zen 4 processors.

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