Date: Sat, 24 Aug 2024 17:06:21 +0000 From: Poul-Henning Kamp <phk@phk.freebsd.dk> To: current@freebsd.org Subject: powerd forgets top CPU frequency ? Message-ID: <202408241706.47OH6LfG023651@critter.freebsd.dk>
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On T14s thinkpad running: FreeBSD critter.freebsd.dk 15.0-CURRENT FreeBSD 15.0-CURRENT #7 main-n271455-a1740cb93639-dirty: Thu Aug 1 09:45:40 UTC 2024 root@critter.freebsd.dk:/critter/obj/critter/FreeBSD/src/amd64.amd64/sys/GENERIC-NODEBUG amd64 When I run two 100% CPU loaded processes, the machine gradually gets slower and slower, until eventually it limps along at 500-ish MHz rates. Killing powerd and starting it again seems to bring the machine back to full speed (for some time). Looking at the powerd -v output, my gut feeling is that powerd sometimes looses track of what the (current) top frequency is and thus gradually drags the machine slower or slower... I have had a faint feeling for some time that this machine runs significantly faster after a reboot, but I have no observations to support that. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.help
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