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Linux 6.15 Git Tanked Nginx HTTPS Web Server Performance - Here's The Bisect
With the Linux 6.15 kernel settling down nicely, I've been testing out the current Linux Git state on more systems in looking for any performance changes.
The AMD EPYC 9655 with 96 cores / 192 threads while clocking up to 4.5GHz and boasting a 384MB cache and just a 400 Watt TDP makes for light work of kernel builds when resorting to bisecting any interesting regressions... There were also some regressions noted for the OpenJDK Java benchmark DaCapo as well as for the OpenFOAM computational fluid dynamics performance. But the biggest regression by far was with Nginx in the simple single-server HTTPS web server test case.
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