[已解决] cpu 调频和驱动 (frequency set, cpu driver)

[gundamlh]

** PROBLEM SOLVED!!! **

1. . CPU frequency setting and the driver "acpi-cpufreq"
* 
* 请参考  [forums.opensuse.org/showthread.php/500869-Setting-cpu-frequency-manually-and-the-driver-acpi-cpufreq?p=2664165#post2664165](https://forums.opensuse.org/showthread.php/500869-Setting-cpu-frequency-manually-and-the-driver-acpi-cpufreq?p=2664165#post2664165)
* 
5. . Compiling the math library ATLAS on openSUSE 13.1
* 
* 有需要的同学，可以回帖问.

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这个问题捣鼓了半天了，解决不了，麻烦大家帮忙看看，先在此谢谢大家了！

Q： 能否在 openSUSE 13.1 中，安装 类似于 “acpi-cpufreq” 的 cpu driver，从而能够“人为”设定 cpu 频率？

相关的回答和疑问：

1. en.opensuse.org/Powersaving

What is not done CPU throttling (ACPI T-States) While this can be useful for systems which tend to overheat, it is not an option to save power. Most hardware itself (CPUs) has a good overheat detection and are doing throttling on their own when a certain temperature is reached. The main reason behind why the operation system (kernel/userspace) is not doing it is that throttling doesn’t give you any power savings. The CPU just skips some clock ticks without actually reducing the frequency. It just makes the system slow which in turn means that tasks require more time to finish up keeping the whole system busy. Don’t do that on your own!

但，我就是想要“人为”设定，怎么破？

2. forums.opensuse.org/showthread.php/407955-can-t-disable-cpu-throttling 从帖子里看出，之前有一个 openSUSE 的版本使用的 cpu driver 就是 “acpi-cpufreq”. 我的 openSUSE 13.1 使用的是 intel_pstate 能改吗？

问题背景：
我想安装 math library: ATLAS math-atlas.sourceforge.net/atlas_install/node5.html ，需要强制设定 cpu 的频率。一般方法是使用下面命令： cpupower, cpufreq-set. 但这些命令无法在 openSUSE 13.1 中正常使用，这个系统不提供名为 userspace 的 cpu scaling governor，很可能是因为 cpu 的 driver 是 intel-pstate 而不是 acpi-cpufreq (这个 driver 似乎在 SUSE Linux Enterprise 中提供)。虽然能安装上那个 math library，但经过测试，效果不是很理想，并没有提高计算效率，很可能是因为 cpu 频率设定的问题。

劳烦大家了！
(萌萌的钢蛋)