夏天到了如何为linux降温节能

夏天到了如何为linux降温节能

--lihn1987（转载请注明出处，谢谢）

   
夏天到了，各位的本本肯定要到了面临崩溃的边缘，而台式机cpu风扇的声音可以与F1赛车的声音有的一拼了。。。。

那么如何为我们的CPU降温呢？我们的做法就是为CPU节能
以下是我的做法：

测试环境
操作系统：ubuntu10.04
CPU       ：AMD X4 630 （四核处理器）
首先安装
sudo apt-get install cpufrequtils
该软件可以用来查看cpu的运行模式以及当前频率
运行
cpufreq-info
结果如下所示

cpufrequtils 006: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to [e-mail], please.
analyzing CPU 0:
driver: powernow-k8
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 8.0 us.
hardware limits: 800 MHz - 2.80 GHz
available frequency steps: 2.80 GHz, 2.10 GHz, 1.60 GHz, 800 MHz
available cpufreq governors: conservative, ondemand, userspace, powersave, performance
current policy: frequency should be within 800 MHz and 2.80 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 2.80 GHz.
cpufreq stats: 2.80 GHz:10.37%, 2.10 GHz:0.14%, 1.60 GHz:0.56%, 800 MHz:88.93%  (6395)
analyzing CPU 1:
driver: powernow-k8
CPUs which run at the same hardware frequency: 1
CPUs which need to have their frequency coordinated by software: 1
maximum transition latency: 8.0 us.
hardware limits: 800 MHz - 2.80 GHz
available frequency steps: 2.80 GHz, 2.10 GHz, 1.60 GHz, 800 MHz
available cpufreq governors: conservative, ondemand, userspace, powersave, performance
current policy: frequency should be within 800 MHz and 2.80 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 800 MHz.
cpufreq stats: 2.80 GHz:37.15%, 2.10 GHz:0.10%, 1.60 GHz:0.70%, 800 MHz:62.04%  (3481)
analyzing CPU 2:
driver: powernow-k8
CPUs which run at the same hardware frequency: 2
CPUs which need to have their frequency coordinated by software: 2
maximum transition latency: 8.0 us.
hardware limits: 800 MHz - 2.80 GHz
available frequency steps: 2.80 GHz, 2.10 GHz, 1.60 GHz, 800 MHz
available cpufreq governors: conservative, ondemand, userspace, powersave, performance
current policy: frequency should be within 800 MHz and 2.80 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 800 MHz.
cpufreq stats: 2.80 GHz:12.35%, 2.10 GHz:0.13%, 1.60 GHz:0.65%, 800 MHz:86.87%  (7569)
analyzing CPU 3:
driver: powernow-k8
CPUs which run at the same hardware frequency: 3
CPUs which need to have their frequency coordinated by software: 3
maximum transition latency: 8.0 us.
hardware limits: 800 MHz - 2.80 GHz
available frequency steps: 2.80 GHz, 2.10 GHz, 1.60 GHz, 800 MHz
available cpufreq governors: conservative, ondemand, userspace, powersave, performance
current policy: frequency should be within 800 MHz and 2.80 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 800 MHz.
cpufreq stats: 2.80 GHz:32.48%, 2.10 GHz:0.12%, 1.60 GHz:0.35%, 800 MHz:67.06%  (3615)




我们要做的就是调节cpu的模式
使用
suod cpufreq-set -g 《模式》
powersave，是无论如何都只会保持最低频率的所谓“省电”模式；
userspace，是自定义频率时的模式，这个是当你设定特定频率时自动转变的；
ondemand，默认模式。一有cpu计算量的任务，就会立即达到最大频率运行，等执行完 毕就立即回到最低频率；
conservative，翻译成保守（中庸）模 式，会自动在频率上下限调整，和ondemand的区别在于它会按需分配频率，而不是一味追求最高频率；
performance，顾名思义只注重效率，无论如何一直保持以最大频率运行。

假如你选择的是自定义模式的话可以通过

sudo cpufreq-set -f 你所需要的频率

注意，此处的频率必须是以KHz为单 位，并且是可以达到的频率（也就是用cpufreq-info查看到的各个频率），cpu频率＝倍频x外频。以下凡是涉及频率的一律如此。


而在自动调节下，也可以设置其上限和下限

sudo cpufreq-set -d 频率下限

sudo cpufreq-set -u 频率上限
这个可以用来超频哦～～～～～～