when I feel a need for speed, I boot mitigations=off kpti=off nopti page_poison=off noibrs noibpb nospectre_v2 nobp=0 nospec nogmb nospec_store_bypass_disable kernel.kptr_restrict=0 etc.
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The paper here https://dl.acm.org/citation.cfm?id=3359640 … also points on similar lines as to how things like fixes for Meltdown have reduced performance of the Linux kernel
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The right comparison is between an Intel processor *with* the mitigations and a non-Intel processor *without* the (unnecessary) mitigations. It is unfair to blame security work for a performance loss.
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So, was your expectation matched in production (the 6% ceiling)?
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I measure ~600% on Skylake in this testhttps://gist.github.com/teknoraver/ebee75c5bc4eb8533b8e761d0e57b7d9 …
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Did it? I was hoping to get a better wifi throughout on 4.14 in top of currently struggling 4.9
. Perf gave some clue but not enough to rule out any of PCIe, RF or n/w stack
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how can something get slower 800%? is it reverse-processing or something?
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It took a minute before, it takes 8 minutes now.
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