Retbleed Impact, Overall CPU Security Mitigation Cost For Intel Xeon E3 v5 Skylake

With the PostMark I/O test the default mitigated state is now at 56% of the unmitigated state. As seen in the difference with retbleed=off, the new Linux kernel patches can be a significant new tax on these older affected processors.

The impact of Linux gaming from these CPU security mitigations remains quite small and for most CPUs tend to show no difference though the Xeon E3-1245 v5 with integrated graphics did see some difference.

In the local networking tests there were sizable new performance penalties with Retbleed mitigations added.