Date: Tue, 21 Jan 2020 20:16:22 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 234455] CPU frequency scaling fails for multiple cores Message-ID: <bug-234455-227-a9IX2Kf1Cg@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-234455-227@https.bugs.freebsd.org/bugzilla/> References: <bug-234455-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D234455 --- Comment #5 from Conrad Meyer <cem@freebsd.org> --- @Dave, did you try debug.acpi.disabled=3D"thermal"? It seems bizarre that = the default dev.cpu.0.freq is 800. Is that the case at boot, or was your initi= al description after running, say, powerd? It might be that Coffeelake does n= ot really support est and needs Intel Speed Shift instead. That is not yet in tree but there is a work-in-progress patch: https://reviews.freebsd.org/D18= 028 @Erich, I suspect these are unrelated issues in that a different cpufreq dr= iver is used on Zen (hwpstate) and Intel (est). But maybe there is some relatio= n. I do not recommend powerd and would suggest disabling it. In fact, we shou= ld probably remove it from FreeBSD. It is extremely legacy and only really wo= rks correctly on ancient single core devices. I also don't recommend manual p-state setting via sysctl. Modern CPUs do a fantastic job of power saving with C states alone =E2=80=94 P-state throttl= ing doesn't get you much anymore. --=20 You are receiving this mail because: You are the assignee for the bug.=
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