A Look At The MDS Cost On Xeon, EPYC & Xeon Total Impact Of Affected CPU Vulnerabilities
While some readers expressed a hypothesis that the MDS mitigations may be more profound on high-core count systems, fortunately, that didn't appear to be the case.
The MDS/Zombieload mitigation cost on the dual Xeon 6138 server was noticeable, but at least not as bad as what we saw on some of the Intel desktop systems or even the E3-1275 v6 in some of the scenarios. And at least the new Cascade Lake Xeon server CPUs do not need any additional/new protection against MDS.