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September 1, 2018 08:04 pm

How Do Spectre/Meltdown Fixes Affect The Linux Kernel?

"Using the newly minted Linux 4.19 feature code, fresh benchmarks were carried out looking at the performance cost of Spectre/Meltdown/Foreshadow mitigations on Intel Xeon v. AMD EPYC CPUs," writes an anonymous Slashdot reader:Workloads affected by these CPU vulnerabilities mainly deal with I/O and frequent kernel calls while CPU bound tests are still found to be minimally impacted. When toggling these mitigations on Linux 4.19, Intel Xeon CPUs were found to be 10~15% slower with the default kernel while AMD EPYC CPUs dropped to about 5% slower.

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Original Link: http://rss.slashdot.org/~r/Slashdot/slashdot/~3/f1Br4gRR6V4/how-do-spectremeltdown-fixes-affect-the-linux-kernel

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