Linux: AMD Phenom II and AMD Athlon II CPU Change Frequency On All Logical Cores

Author: Vivek Gite Last updated: July 2, 2010 0 comments

I’ve AMD Athlon II processors based server and it does not change frequency on all logical cores under CentOS version 5.5 or RHEL Linux. How do I fix this problem?

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The default CPU frequency scaling method uses powernow-k8 frequency driver module, and the ACPI data provided by BIOS, are not compatible with each other. It may not work at all to save power. To fix this problem Edit /etc/modprobe.conf file, enter:
# vi /etc/modprobe.conf
Append the following line:

options powernow-k8 preregister_acpi_perf=0

Save and close the file. It will work after reboot, however you can fix this for current setup by typing the following command as root user:
# /etc/init.d/ cpuspeed stop # /sbin/rmmod powernow_k8 # /sbin/modprobe powernow-k8 preregister_acpi_perf=0 # /etc/init.d/cpuspeed start

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