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__rdtscp instruction should be used instead of __rdtsc #6

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ujos opened this issue Dec 17, 2021 · 1 comment
Open

__rdtscp instruction should be used instead of __rdtsc #6

ujos opened this issue Dec 17, 2021 · 1 comment
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@ujos
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ujos commented Dec 17, 2021

Because __rdtsc is not serializable CPU is free to reorder the execution of this instruction which could lead to wrong latency measurements results.

Instead the serializable version __rdtscp should be used.
@dendibakh dendibakh added the bug Something isn't working label Dec 17, 2021
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Ok, I think you're right. At the same time, __rdtscp is more expensive. I guess I need to revisit that part. Thanks for the note.

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