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A Linux 6.15 Performance Regression Hits Modern AMD CPUs
Separate from last week in uncovering a big performance regression on Linux 6.15 affecting workloads like Nginx and that regression getting fixed, I unfortunately discovered another heavy-hitting regression on Linux 6.15.
Code compilation benchmarks were noticeably slower when running atop the Linux 6.15 Git kernel... 10% slower code compilation jobs from a kernel upgrade? But it wasn't just code compilation tasks that were slower on the new kernel but also high performance computing (HPC) workloads, video encoding/transcoding, image encoding, digital signal processing, and a variety of other workloads. At that point I knew my weekend would be over and spent exploring this performance regression.
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