How Do Spectre/Meltdown Fixes Affect The Linux Kernel? (phoronix.com)

"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.

Comments

Re:As expected

[gweihir]

Indeed. And this partially explained why Intel was ahead of AMD speed-wise. They played fast and loose and f*** the customer.