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From: "Artem S. Tashkinov" <t.artem@lycos.com>
To: linux-kernel@vger.kernel.org
Cc: davej@redhat.com, cpufreq@vger.kernel.org
Subject: cpufreq userspace governor doesn't work for Intel Core 2 Gen 2 CPUs
Date: Sun, 25 Dec 2011 18:36:29 +0000 (GMT)	[thread overview]
Message-ID: <388674780.142932.1324838189780.JavaMail.mail@webmail18> (raw)
In-Reply-To: 1982761334.142905.1324837801755.JavaMail.mail@webmail18

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

           reply	other threads:[~2011-12-25 18:36 UTC|newest]

Thread overview: expand[flat|nested]  mbox.gz  Atom feed
 [parent not found: <1982761334.142905.1324837801755.JavaMail.mail@webmail18>]

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