Date: Tue, 08 Jan 2019 07:17:11 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 234733] Setting CPU frequency with sysctl dev.cpu.0.fr slows a Ryzen 2700X down Message-ID: <bug-234733-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D234733 Bug ID: 234733 Summary: Setting CPU frequency with sysctl dev.cpu.0.fr slows a Ryzen 2700X down Product: Base System Version: 12.0-STABLE Hardware: amd64 OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: freebsd.ed.lists@sumeritec.com Issuing sysctl dev.cpu.0.fr=3D3700 or any other value for frequency slows the system down by nearly 50%. System has a Ryzen 2700X as a CPU. How to repeat: Reboot the system with all power saving tools disabled. Compile the world, it will take around 2h30min on the system mentioned abov= e if that system call is never used. Now issue the command sysctl dev.cpu.0.fr=3D3700 which would bring a Ryzen 2700X to its nominal operating frequency. Compile the world, it will take now around 4h30min. I could repeat this error several times thinking originally that it is a po= werd problem. An e-mail by Andrea Venturoli (21 Dec 2018 17:40:49) made me look a bit into powerd. --=20 You are receiving this mail because: You are the assignee for the bug.=
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