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Linux Address Space Isolation "ASI" Revived After Lowering 70% Performance Hit To 13%

Several years ago Google engineers began exploring address space isolation for the Linux kernel and ultimately proposing Linux ASI for better dealing with CPU speculative execution attacks

While the hope was it would better cope with the ever growing list of CPU speculative execution vulnerabilities, the effort was thwarted initially by I/O throughput seeing a 70% performance hit. Jackman added:"Despite my title these numbers are kinda disappointing to be honest, it's not where I wanted to be by now, but it's still an order-of-magnitude better than where we were for native FIO a few months ago. With this LKML thread the hope now is to figure out if the state is improving good enough that the ASI work can move forward for potentially upstreaming into the Linux kernel.

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