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<pre><span style="color:black">>On Thu, Feb 26, 2015 at 08:46:56PM +0530, <a href="http://lists.freedesktop.org/mailman/listinfo/intel-gfx">deepak.s at linux.intel.com</a> wrote:<o:p></o:p></span></pre>
<pre><span style="color:black">>><i> From: Deepak S <<a href="http://lists.freedesktop.org/mailman/listinfo/intel-gfx">deepak.s at linux.intel.com</a>><o:p></o:p></i></span></pre>
<pre><span style="color:black">>><i> <o:p></o:p></i></span></pre>
<pre><span style="color:black">>><i> After feedback from the hardware team, now we set the GPU min freq to RPe.<o:p></o:p></i></span></pre>
<pre><span style="color:black">>><i> If we drop the freq to RPn, we found that the punit was not setting the<o:p></o:p></i></span></pre>
<pre><span style="color:black">>><i> voltage to Vnn, So recommendation is to set min freq to RPe.<o:p></o:p></i></span></pre>
<pre><span style="color:black"><o:p> </o:p></span></pre>
<pre><span style="color:black">>And does it change the voltage at all? Is there really any advantage to<o:p></o:p></span></pre>
<pre><span style="color:black">>the extra code on idle? Does efficient_freq really consume less power<o:p></o:p></span></pre>
<pre><span style="color:black">>than min_freq when active (assuming a min_freq/efficient_freq busy<o:p></o:p></span></pre>
<pre><span style="color:black">>workload i.e. does a workload that would be 100% busy at min_freq<o:p></o:p></span></pre>
<pre><span style="color:black">>consume less power when run at efficient_freq)?<o:p></o:p></span></pre>
<pre><span style="color:black">>-Chris<o:p></o:p></span></pre>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Power team is reporting ~140mW delta at idle using efficient freq - definitely significant.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Gavin <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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