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Native BHI Mitigation Performance Benchmarks On Core i9 14900K Under Linux 6.9
With the new security mitigation for the 'Native BHI' Spectre vulnerability affecting even the recent Intel processors, a number of Phoronix readers have been curious about the performance impact of the mitigation
With the Native BHI mitigation for Linux, the branch history needs to be cleared at system call entry and VM exit. I used an Intel Core i9 14900K for running some Linux benchmarks of the impact of the stock kernel with the new default BHI_DIS_S mitigation for Spectre-BHI (Native BHI) and then repeating the tests in the spectre_bhi=off mode. In the rest of the workloads having this Native Spectre BHI mitigation enabled didn't show any real difference, which is good to see compared to some of the CPU security mitigation overhead in the past.About The AuthorMichael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience.
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