The Speculative Execution Impact For A 4-Core POWER9: Last year we looked at the Spectre mitigation cost on POWER9 using the high-end Talos II server while now several kernel releases later and also having the desktop Blackbird system in our lab, here is a look at how the Spectre/Meltdown mitigation impact is for an IBM POWER9 4-core processor running Ubuntu 19.04.

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