From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Artem S. Tashkinov" Subject: cpufreq userspace governor doesn't work for Intel Core 2 Gen 2 CPUs Date: Sun, 25 Dec 2011 18:36:29 +0000 (GMT) Message-ID: <388674780.142932.1324838189780.JavaMail.mail@webmail18> References: <1982761334.142905.1324837801755.JavaMail.mail@webmail18> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: Sender: linux-kernel-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" To: linux-kernel@vger.kernel.org Cc: davej@redhat.com, cpufreq@vger.kernel.org Hello, On my Intel Core i5 CPU with acpi-cpufreq module loaded I do this # echo 2000000 | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_setspeed then # cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_cur_freq 2000000 2000000 2000000 2000000 so theoretically it should work. However i7z (http://code.google.com/p/i7z/) shows that CPU frequency is freely floating and turbo boost gets enabled as soon as I have any discernible load, in other words userspace CPU frequency driver doesn't work at all and it doesn't really enforce the specified CPU frequency. Best wishes, Artem