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/>
index | next in thread | previous in thread | raw e-mail
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234455 --- Comment #5 from Conrad Meyer <cem@freebsd.org> --- @Dave, did you try debug.acpi.disabled="thermal"? It seems bizarre that the default dev.cpu.0.freq is 800. Is that the case at boot, or was your initial description after running, say, powerd? It might be that Coffeelake does not 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/D18028 @Erich, I suspect these are unrelated issues in that a different cpufreq driver is used on Zen (hwpstate) and Intel (est). But maybe there is some relation. I do not recommend powerd and would suggest disabling it. In fact, we should probably remove it from FreeBSD. It is extremely legacy and only really works 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 — P-state throttling doesn't get you much anymore. -- You are receiving this mail because: You are the assignee for the bug.help
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?bug-234455-227-a9IX2Kf1Cg>