The Linux 6.15 kernel cycle started off a bit rough with [1]a heavy hitting performance regression spotted and then [2]fixed but to only then discover [3]another Linux 6.15 performance regression affecting modern AMD CPUs. Fortunately those issues were cleared out in time for the recent [4]Linux 6.15 stable release. Linux 6.15 stable is looking good especially on 5th Gen AMD EPYC "Turin" servers with some recent benchmarks showing some modest gains over the Linux 6.14 kernel.

[5]

Last week I highlighted some of [6]the Linux 6.15+ performance gains spotted on AMD Ryzen AI Max "Strix Halo" while today's round of Linux 6.15 kernel benchmarking is looking at how that stable kernel is performing for the AMD EPYC 9005 series.

Using an AMD EPYC 9755 2P server with AMD's Volcano reference server platform, I carried out a fresh round of benchmarking on Ubuntu 25.04 to see how the performance changes going from Linux 6.14 to Linux 6.15 stable. No other hardware or software changes were made besides upgrading to the recently released Linux 6.15 kernel. The Ubuntu Mainline Kernel PPA kernels were used for testing in allowing easy reproducibility.



[1] https://www.phoronix.com/review/linux-615-nginx-regression

[2] https://www.phoronix.com/review/linux-615-regression-fix

[3] https://www.phoronix.com/review/linux-615-amd-regression

[4] https://www.phoronix.com/search/Linux+6.15

[5] https://www.phoronix.com/image-viewer.php?id=linux-615-epyc-performance&image=penguin_epyc_lrg

[6] https://www.phoronix.com/news/Linux-6.15-6.16-AMD-Strix-Halo