Date: Sat, 6 Dec 2025 06:14:07 -0800 From: Mark Millard <marklmi@yahoo.com> To: mjguzik@gmail.com, FreeBSD Current <freebsd-current@freebsd.org>, FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: RE: performance regressions in 15.0 Message-ID: <EF95C136-B1D2-4820-A069-D0078A3B5A05@yahoo.com>
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Mateusz Guzik <mjguzik_at_gmail.com> wrote on Date: Sat, 06 Dec 2025 10:50:08 UTC : > I got pointed at phoronix: https://www.phoronix.com/review/freebsd-15-amd-epyc > > While I don't treat their results as gospel, a FreeBSD vs FreeBSD test > showing a slowdown most definitely warrants a closer look. > > They observed slowdowns when using iperf over localhost and when compiling llvm. > > I can confirm both problems and more. > > I found the profiling tooling for userspace to be broken again so I > did not investigate much and I'm not going to dig into it further. > > Test box is AMD EPYC 9454 48-Core Processor, with the 2 systems > running as 8 core vms under kvm. > . . . Both of the below are from ampere3 (aarch64) instead, its 2 most recent "bulk -a" runs that completed, elapsed times shown for qt6-webengine-6.9.3 builds: 150releng-arm64-quarterly qt6-webengine-6.9.3 53:33:46 135arm64-default qt6-webengine-6.9.3 38:43:36 For reference: Host OSVERSION: 1600000 Jail OSVERSION: 1500068 vs. Host OSVERSION: 1600000 Jail OSVERSION: 1305000 The difference for the above is in the Jail's world builds, not in the boot's (kernel+world) builds. For reference: https://pkg-status.freebsd.org/ampere3/build.html?mastername=150releng-arm64-quarterly&build=88084f9163ae build of www/qt6-webengine | qt6-webengine-6.9.3 ended at Sun Nov 30 05:40:02 -00 2025 build time: 2D:05:33:52 https://pkg-status.freebsd.org/ampere3/build.html?mastername=135arm64-default&build=f5384fe59be6 build of www/qt6-webengine | qt6-webengine-6.9.3 ended at Sat Nov 22 15:33:34 -00 2025 build time: 1D:14:43:41 === Mark Millard marklmi at yahoo.comhome | help
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