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The Performance Impact Of GCC CPU Tuning On The Linux Kernel's Performance

Submitted by Rianne Schestowitz on Thursday 28th of February 2019 02:16:07 AM Filed under
Graphics/Benchmarks

Last week there was the patch being proposed for the mainline Linux kernel that has long been carried by Gentoo's kernel to provide CPU optimization options, which were quickly shot-down by upstream maintainers, there were many requests to benchmark said patches... Here are dozens of performance figures looking at the performance impact of these optimizations for AMD Zen (znver1), Skylake, and Skylake X (Skylake-AVX512) compared to a stock mainline kernel build on several different systems.

The main patch proposed offers up Kconfig options so at build time users can select their CPU microarchitecture from old AMD Barcelona and Bobcat systems through Znver1 and then on the Intel side from Nehalem through Icelake and Cannonlake generations. Depending upon the CPU generation selected, the kernel would be built with the respective "-march=" compiler flag for optimizing the generated instructions for that particular generation of x86_64 processors. This functionality has long been an option for Gentoo users building their own kernel to cater their own build for their particular CPU in use, but over the years hasn't been accepted upstream. The patch is quite simple with really GCC doing all of the actual work for the optimizations of the generated kernel binary.

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