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14.04 - How I can disable CPU frequency scaling and set the system to performance? - Ask Ubuntu.html
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<h1 itemprop="name"><a href="http://askubuntu.com/questions/523640/how-i-can-disable-cpu-frequency-scaling-and-set-the-system-to-performance" class="question-hyperlink">How I can disable CPU frequency scaling and set the system to performance?</a></h1>
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<p>My processor is running at 40% of its maximum speed, I want it to use
100% of the speed, all the time. I searched on Google but the tutorials
are very old and they all differ.</p>
<p>So, how can I permanently disable CPU frequency scaling and set my system to performance mode?</p>
<p>Please, only terminal based solutions, I don't want applets.</p>
<p>I'm using Xubuntu 14.04 x64.</p>
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asked <span title="2014-09-13 18:25:10Z" class="relativetime">Sep 13 '14 at 18:25</span>
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<span class="comment-copy">For the curious: <a href="https://idebian.wordpress.com/2008/06/22/cpu-frequency-scaling-in-linux/" rel="nofollow">CPU frequency scaling in Linux</a></span>
– <a href="http://askubuntu.com/users/419514/j%c3%a9r%c3%b4me" title="101 reputation" class="comment-user">Jérôme</a>
<span class="comment-date" dir="ltr"><a class="comment-link" href="#comment1119106_523640"><span title="2016-03-26 21:35:59Z" class="relativetime-clean">Mar 26 at 21:35</span></a></span>
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<p>After struggling with <code>ondemand</code> for a while, I will share how to permanently disable it in Ubuntu and its derivates.</p>
<p>Install <code>cpufrequtils</code>:</p>
<pre><code>sudo apt-get install cpufrequtils
</code></pre>
<p>Then edit the following file (if it doesn't exist, create it):</p>
<pre><code>sudo nano /etc/default/cpufrequtils
</code></pre>
<p>And add the following line to it:</p>
<pre><code>GOVERNOR="performance"
</code></pre>
<p>Save and exit.</p>
<p>Now you need to disable <code>ondemand</code> daemon, otherwise after you reboot the settings will be overwritten.</p>
<pre><code>sudo update-rc.d ondemand disable
</code></pre>
<p>And you are done!</p>
<p>You can check your settings with:</p>
<pre><code>cpufreq-info
</code></pre>
<p>It will show a block of information for every core your processor
has. Just check if all of then are in performance mode, and at the
maximum speed of your processor.</p>
<p><strong>Update:</strong></p>
<p><strong>The Debian Wiki says that <code>sysfsutils</code> is necessary in order to maintain the settings across reboots, but that is untrue. Also, enabling <code>sysfsutils</code> make my system unstable, so it's not recommended.</strong></p>
<p>Sorry if I misspelled something. :)</p>
<p>Sources:</p>
<ul>
<li><a href="https://wiki.debian.org/HowTo/CpuFrequencyScaling">https://wiki.debian.org/HowTo/CpuFrequencyScaling</a></li>
<li><a href="http://askubuntu.com/questions/3924/disable-ondemand-cpu-scaling-daemon">Disable "ondemand" CPU scaling daemon</a></li>
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<a href="http://askubuntu.com/posts/523690/revisions" title="show all edits to this post">edited <span title="2015-10-15 16:09:47Z" class="relativetime">Oct 15 '15 at 16:09</span></a>
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answered <span title="2014-09-13 21:13:03Z" class="relativetime">Sep 13 '14 at 21:13</span>
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<span class="comment-copy"><code>/etc/default/cpufrequtils/</code> doesn't exist on my Ubuntu 14.04, it seems that the correct path is <code>/etc/init.d/cpufrequtils</code></span>
– <a href="http://askubuntu.com/users/79368/ecerulm" title="461 reputation" class="comment-user">ecerulm</a>
<span class="comment-date" dir="ltr"><a class="comment-link" href="#comment863656_523690"><span title="2015-04-24 13:57:32Z" class="relativetime-clean">Apr 24 '15 at 13:57</span></a></span>
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<span class="comment-copy">I did this with my server but
I'm wondering if I should disable it after doing what I needed to do.
Is this going to kill my server in the long run?</span>
– <a href="http://askubuntu.com/users/396829/david-%e5%a4%a9%e5%ae%87-wong" title="101 reputation" class="comment-user">David 天宇 Wong</a>
<span class="comment-date" dir="ltr"><a class="comment-link" href="#comment877670_523690"><span title="2015-05-07 20:13:09Z" class="relativetime-clean">May 7 '15 at 20:13</span></a></span>
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<span class="comment-copy">@ecerulm: <code>/etc/default/cpufrequtils/</code> is sourced in <code>/etc/init.d/cpufrequtils</code> so it works just as well, and it is easier to maintain your own settings over package updates if configured in <code>/etc/default/cpufrequtils/</code>.</span>
– <a href="http://askubuntu.com/users/419514/j%c3%a9r%c3%b4me" title="101 reputation" class="comment-user">Jérôme</a>
<span class="comment-date" dir="ltr"><a class="comment-link" href="#comment931393_523690"><span title="2015-07-15 21:31:45Z" class="relativetime-clean">Jul 15 '15 at 21:31</span></a></span>
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<span class="comment-copy">Actually, on my 3.19.0-51-generic ubuntu server "performance" is default overridden by <code>/etc/init.d/ondemand</code> Thus, reboot after <code>sudo update-rc.d ondemand disable</code> is all I needed.</span>
– <a href="http://askubuntu.com/users/420954/wick" title="108 reputation" class="comment-user">wick</a>
<span class="comment-date" dir="ltr"><a class="comment-link" href="#comment1104423_523690"><span title="2016-03-05 19:24:20Z" class="relativetime-clean">Mar 5 at 19:24</span></a></span>
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<span class="comment-copy">My A8-4500M still throttles although the temperature is below 80C since I undervolted it</span>
– <a href="http://askubuntu.com/users/480305/suici-doga" title="437 reputation" class="comment-user">Suici Doga</a>
<span class="comment-date" dir="ltr"><a class="comment-link" href="#comment1206270_523690"><span title="2016-07-18 01:20:57Z" class="relativetime-clean">Jul 18 at 1:20</span></a></span>
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<div class="everyonelovesstackoverflow adzerk-vote" id="adzerk1149004439"><div style="background-image: url( data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw== ); width: 1px; height: 1px; display:none;"></div><div class="adzerk-vote-controls" style="display:none;"><div class="adzerk-vote-option adzerk-vote-up"><div class="adzerk-vote-icon"></div></div><div class="adzerk-vote-option adzerk-vote-down"><div class="adzerk-vote-icon"></div></div></div><div class="adzerk-vote-survey" style="display:none;"><form><span>No problem. We won't show you that ad again. Why didn't you like it?</span><ul><li><label><input value="12" name="downvoteReason" type="radio">Uninteresting</label></li><li><label><input value="13" name="downvoteReason" type="radio">Misleading</label></li><li><label><input value="14" name="downvoteReason" type="radio">Offensive</label></li><li><label><input value="15" name="downvoteReason" type="radio">Repetitive</label></li><li><label><input value="16" name="downvoteReason" type="radio">Other</label></li></ul><a href="#" class="adzerk-vote-cancel">Oops! I didn't mean to do this.</a></form></div><img style="position:absolute;" src="14.04%20-%20How%20I%20can%20disable%20CPU%20frequency%20scaling%20and%20set%20the%20system%20to%20performance%3F%20-%20Ask%20Ubuntu_files/i_002.gif" border="0" width="0px" height="0px"></div>
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<p>I cannot comment, so I had to resort to a new answer. For immediate results, make sure you do <code>sudo /etc/init.d/cpufrequtils restart</code> for the new frequency to kick in after you follow all of Dennie's steps.</p>
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answered <span title="2015-02-02 10:39:32Z" class="relativetime">Feb 2 '15 at 10:39</span>
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<p>Try this:</p>
<pre><code>gksu gedit /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
</code></pre>
<p>Replace <code>ondemand</code> with <code>performance</code>. Repeat for every core (increase cpu0: cpu1, cpu2).</p>
<p>If you get save errors, use nano editor:</p>
<pre><code>sudo nano /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
</code></pre>
<p>Source: <a href="http://www.servernoobs.com/avoiding-cpu-speed-scaling-in-modern-linux-distributions-running-cpu-at-full-speed-tips/">Avoiding CPU Speed Scaling – Running CPU At Full Speed</a></p>
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answered <span title="2014-09-13 18:39:44Z" class="relativetime">Sep 13 '14 at 18:39</span>
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<span class="comment-copy">I stumbled with this site earlier, I cannot save the file, both mousepad and nano gives me errors.</span>
– <a href="http://askubuntu.com/users/29853/dennis" title="1,653 reputation" class="comment-user owner">Dennis</a>
<span class="comment-date" dir="ltr"><a class="comment-link" href="#comment712856_523645"><span title="2014-09-13 19:10:06Z" class="relativetime-clean">Sep 13 '14 at 19:10</span></a></span>
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<span class="comment-copy">@Dennis gedit gave errors to
me too, but the file got saved despite the errors. Close the editor and
open it again to see if it is saved.</span>
– <a href="http://askubuntu.com/users/269282/cornelius" title="5,060 reputation" class="comment-user">Cornelius</a>
<span class="comment-date" dir="ltr"><a class="comment-link" href="#comment712862_523645"><span title="2014-09-13 19:12:43Z" class="relativetime-clean">Sep 13 '14 at 19:12</span></a></span>
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<span class="comment-copy">You are right, it was indeed saved. But when I reboot the computer it goes back to ondemand.</span>
– <a href="http://askubuntu.com/users/29853/dennis" title="1,653 reputation" class="comment-user owner">Dennis</a>
<span class="comment-date" dir="ltr"><a class="comment-link" href="#comment712873_523645"><span title="2014-09-13 19:25:52Z" class="relativetime-clean">Sep 13 '14 at 19:25</span></a></span>
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<span class="comment-copy">@Dennis indeed, the same issue addressed <a href="http://askubuntu.com/questions/181461/cpu-frequency-scaling-methods-not-working-lubuntu-12-04?rq=1">here</a>, but no answer...</span>
– <a href="http://askubuntu.com/users/269282/cornelius" title="5,060 reputation" class="comment-user">Cornelius</a>
<span class="comment-date" dir="ltr"><a class="comment-link" href="#comment712874_523645"><span title="2014-09-13 19:27:22Z" class="relativetime-clean">Sep 13 '14 at 19:27</span></a></span>
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