AMD EPYC Rome Still Conquering Cascadelake Even Without Mitigations
With last week's dramatic EPYC "Rome" launch where AMD has blown past Intel Xeon "Cascadelake" performance in a majority of server benchmarks, helping the successful launch of these Zen 2 server processors has been Intel's repeated delays of 10nm/Icelake CPUs and also the Spectre / Meltdown / Zombieload / Foreshadow mitigations. Out of curiosity, I've run some unmitigated benchmarks for the various relevant CPU speculative execution vulnerabilities on both the Intel Xeon Platinum 8280 Cascadelake and AMD EPYC 7742 Rome processors for seeing how the performance differs.
As a reminder, both Cascadelake and Rome offer up different hardware architectural improvements for mitigating against their respective mitigations. Cascadelake no longer requires software mitigations for L1TF/Foreshadow, MDS, Meltdown, and some Spectre variants. But for Spectre V1 it still requires the __user pointer santisifcation, Spectre V4 "speculative store bypass" has mitigations for SSB via Seccomp and Prctl, and Spectre V2 has some hardware protections but still needs IBRS IBPB with conditional return stack buffer (RSB) filling.
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