Linux 5.0 Kernel Performance Is Sliding In The Wrong Direction
Written by Michael Larabel in Software on 22 February 2019. Page 3 of 6. 40 Comments

But in a number of tests, Linux 5.0 Git was trending slightly lower. Within the margin of error for some, that's why the geometric mean was of a lot of interest to get a broader look at the situation as well as going back far in the tested kernel releases to get an idea for the overall trend.

PostgreSQL was coming in slightly lower on Linux 5.0, but at least not as bad as the drop from 4.14 to 4.15.

The synthetic kernel tests from Stress-NG were rather mixed.

The ctx-clock micro-benchmark for looking at the context switching overhead shows the big impact since Spectre/Meltdown, but Linux 5.0 actually had the fastest context switching time of the tested post-4.14 kernels on this Core i9 7960X box.

So of the dozens of benchmarks run there were a lot of workloads where Linux 5.0 was coming in a little bit slower, so then I extended the tests to other systems, including ramping up even more tests on some of the systems.

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