Yes, we have enabled retpoline by default in our 19H1 flights along with what we call "import optimization" to further reduce perf impact due to indirect calls in kernel-mode. Combined, these reduce the perf impact of Spectre v2 mitigations to noise-level for most scenarios.https://twitter.com/aionescu/status/1052705268683943936 …
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We're going to publish a post in our kernel team blog describing the details of our Spectre v2 optimizations including import optimization. Stay tuned.
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