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<body><span class="vcard"><a class="email" href="mailto:srinivas.pandruvada@linux.intel.com" title="Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"> <span class="fn">Srinivas Pandruvada</span></a>
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<a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL] Up to 20% performance regression in GpuTest Triangle, due to 2x higher CPU power usage"
href="https://bugs.freedesktop.org/show_bug.cgi?id=107410">bug 107410</a>
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<td>srinivas.pandruvada@linux.intel.com
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL] Up to 20% performance regression in GpuTest Triangle, due to 2x higher CPU power usage"
href="https://bugs.freedesktop.org/show_bug.cgi?id=107410#c6">Comment # 6</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL] Up to 20% performance regression in GpuTest Triangle, due to 2x higher CPU power usage"
href="https://bugs.freedesktop.org/show_bug.cgi?id=107410">bug 107410</a>
from <span class="vcard"><a class="email" href="mailto:srinivas.pandruvada@linux.intel.com" title="Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"> <span class="fn">Srinivas Pandruvada</span></a>
</span></b>
<pre>Created <span class=""><a href="attachment.cgi?id=140870" name="attach_140870" title="Try these steps">attachment 140870</a> <a href="attachment.cgi?id=140870&action=edit" title="Try these steps">[details]</a></span> <a href='page.cgi?id=splinter.html&bug=107410&attachment=140870'>[review]</a>
Try these steps
1.
First check if you have
/sys/devices/system/cpu/intel_pstate/hwp_dynamic_boost == 1
Unfortunately some Xeon E3 reused DESKTOP CPU ID.
2.
If yes, as Chris suggested, try
#echo 0 > /sys/devices/system/cpu/intel_pstate/hwp_dynamic_boost
If this fixes, try the attached patch. After this patch should be
/sys/devices/system/cpu/intel_pstate/hwp_dynamic_boost == 0 if your platform is
not a E3.
If you still see attach output of
#acpidump > acpi.out</pre>
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