From a Linux perspective, Kroah-Hartman said that in order to mitigate the various CPU vulnerabilities, the Linux kernel has had to do more work, flushing memory buffers to reduce risk among other activities. The additional controls that have been in place to mitigate the issues have also had a performance impact on Linux, that varies based on workload. Kroah-Hartman noted that the mitigations have led to a 15% performance impact for his workloads, which include reading email and building new Linux kernels.
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