Linux 4.14 vs. 4.20 Performance Benchmarks - The Kernel Speed Difference For 2018
On a Core i9 7980XE system, Linux 4.14.4 vs. 4.20 Git (with default Spectre/Meltdown mitigations and then again without) were benchmarked.
Here's a look at the portion of the many kernel benchmarks carried out:
I/O performance was lower on the Linux 4.20 kernel with these tests on EXT4 with an NVMe SSD. Even with disabling Spectre/Meltdown mitigations, in most cases the performance was still lower compared to this point last year.
Disabling these security measures did help in some I/O heavy workloads.
There were performance improvements to note in some of the CPU heavy tests.
But also some performance regressions.
Dozens more benchmark results from this Linux kernel comparison on the Core i9 system can be found via this OpenBenchmarking.org result file.