Date: Tue, 8 Sep 2015 08:59:04 +0300 From: Jukka Ukkonen <jau789@gmail.com> To: freebsd-amd64@freebsd.org Subject: Something odd with CPU frequency levels on AMD EE processors Message-ID: <55EE7928.1000804@gmail.com>
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Hello all, Previously my AMD EE CPUs have been reporting frequency levels all the way down to 100 MHz and powerd also used those quite nicely. Yesterday I noticed the fans running at much higher speed than what has been normal on a mostly idle system. Now "sysctl dev.cpu.0" shows me this... dev.cpu.0.cx_usage: 100.00% last 622us dev.cpu.0.cx_lowest: C8 dev.cpu.0.cx_supported: C1/1/0 dev.cpu.0.freq_levels: 1700/3870 1500/3461 1300/3105 1100/2720 800/2193 dev.cpu.0.freq: 800 dev.cpu.0.temperature: 34.6C dev.cpu.0.%parent: acpi0 dev.cpu.0.%pnpinfo: _HID=none _UID=0 dev.cpu.0.%location: handle=\_PR_.P001 dev.cpu.0.%driver: cpu dev.cpu.0.%desc: ACPI CPU The system no longer sees the lower CPU frequency levels at all. Obviously it will not try using them either. This change must have been quite recent. Otherwise I would have noticed the fans running at unusually high speeds much earlier than yesterday evening. In any case now the idle system consumes much more power than it really needs to producing only heat which is exactly what I had tried to avoid when choosing the EE CPUs. Here is the output from "uname -a" showing the OS version, the SVN version number, and the time of the latest build. FreeBSD sleipnir 10.2-STABLE FreeBSD 10.2-STABLE #0 r287529: Mon Sep 7 09:39:36 EEST 2015 root@sleipnir:/usr/obj/usr/src-10.2/sys/Sleipnir amd64 I hope someone has an idea what has happened. I would really like to enable the lower frequency levels again as soon as possible. --jau
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