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Can recompiling the kernels with LFENCE mitigate spectre and meltdown?

published Jan 14, 2018 12:15   by admin ( last modified Jan 14, 2018 12:15 )

Daniel J. Bernstein on Twitter:

Even with today's ludicrously bloated kernels, I'm skeptical about the idea that speculative execution _in the kernel_ seriously helps computer performance. Has anyone measured overall slowdown from recompiling kernel branches to use LFENCE with new (fully serializing) microcode?

https://twitter.com/hashbreaker/status/951550271624241152