The implementation of the RDTSC instruction is probably a lot more complex than one might initially expect. Did something go wrong with all the various tweaks to TSC behavior that have occurred over the years? Or is this just an expected side-effect of various CPU instruction processing optimizations? No matter when/where I call RDTSC and no matter how many times I do so and no matter what I put in-between those calls - they are always even values. JitterEntropy timestamp collection) as well as the attached user-space program. This occurs both when calling rdtsc() from inside the kernel (i.e. I've tried different optimization options on the GNU C compiler to make sure there wasn't some obvious optimizations that might impact this. I'm running on various versions of the linux kernel including 4.4.12, 4.4.111, 5.4.72 as well as macOS Big Sur.

However, there are some chips that return both even and odd values (least significant bit is set): I've found that the RDTSC instruction only ever returns even values (least significant bit is never set) on several of the chips I have access to.

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