Toggling Spectre Mitigations On Xeon Scalable Ice Lake Show Little Runtime Difference

As usual when getting my hands on a new processor family, I was curious about the performance difference if booting the Xeon Platinum 8380 "Ice Lake" processors with the Spectre security mitigations disabled at run-time. Ultimately there was very little difference when using the standard "mitigations=off" option for these new Intel server processors...