This article isn't comparing the combined impact of the other speculative execution mitigations, the JCC Erratum, or any other combinations. Follow-up articles will be looking at the different combinations while for today is just seeing what this new TSX Async Abort code in the kernel presents. Also keep in mind for all these tests today SMP/HT was left enabled, but again the current no-HT performance is something that will be revisited in the future.
When firing up different benchmarks found to be impacted by the TAA mitigations, the geometric mean of those results pointed to the Cascade Lake server running just under 8% slower from the new kernel mitigation this week on affected workloads. Meanwhile disabling TSX and running TSX without any mitigations yielded similar performance.
https://howbad.info/
