Linux 4.20 Showing Some Performance Slowdowns
Being well past the Linux 4.20 merge window I have moved onto benchmarking more of this development version of the Linux kernel. Unfortunately, there are some clear performance regressions.
This week I got to firing off some Linux 4.20 kernel benchmarks... I started with the AMD Ryzen Threadripper 2990WX and Intel Core i9 7980XE for being the interesting HEDT CPUs in my possession at the moment. On the 7980XE I spotted several performance regressions with this Linux 4.20 development kernel compared to Linux 4.19 and 4.18, so then I fired up the completely separate Intel Core i9 7960X box to carry out the same tests. Sure enough, with that different hardware, there is further confirmation of slowdowns with Linux 4.20.
The common trait of these systems was Ubuntu 18.10 x86_64 and using the Linux 4.18.18, 4.19.1, and 4.20 Git kernel packages provided by the Ubuntu Mainline Kernel PPA. With the differing hardware the intention is not to compare the performance between the systems but in looking at the direction of the Linux kernel performance.
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