https://community.intel.com/t5/Software-Archive/DVFS-modifying-the-processor-voltage/m-p/904574#M11313 Hello,<BR />I am using cpuspeed daemon (userspace module ) to modify the processor frequency of my processors. Does this automatically <BR />scale down or scale up the voltage too? Or is there a separate command to modify the voltage of a processor?<BR />If so, what is it?<BR /><BR />I have Xeon 5520 Nahelem processor. and OS is CentOS 5.3.<BR /><BR />Regards,<BR />Priya Thu, 22 Oct 2009 20:16:07 GMT priyagps 2009-10-22T20:16:07Z https://community.intel.com/t5/Software-Archive/DVFS-modifying-the-processor-voltage/m-p/904574#M11313 Hello,<BR />I am using cpuspeed daemon (userspace module ) to modify the processor frequency of my processors. Does this automatically <BR />scale down or scale up the voltage too? Or is there a separate command to modify the voltage of a processor?<BR />If so, what is it?<BR /><BR />I have Xeon 5520 Nahelem processor. and OS is CentOS 5.3.<BR /><BR />Regards,<BR />Priya Thu, 22 Oct 2009 20:16:07 GMT https://community.intel.com/t5/Software-Archive/DVFS-modifying-the-processor-voltage/m-p/904574#M11313 priyagps 2009-10-22T20:16:07Z https://community.intel.com/t5/Software-Archive/DVFS-modifying-the-processor-voltage/m-p/904575#M11314 <DIV style="margin: 0px; height: auto;"> <DIV id="quote_reply" style="margin-top: 5px; width: 100%; height: auto;"></DIV> </DIV> <P class="sectionBody"><BR /><SPAN style="font-size: x-small;"><SPAN style="font-size: small;">We asked our engineering contacts, who responded that voltage changes are automatically built into processor performance states. Also, the Linux* cpufreq "userspace" governor and the cpuspeed daemon have been obsolete for several years, having been replaced by the "ondemand" in-kernel governor.<BR /><BR />Our contacts also recommend that you join the </SPAN><A href="mailto:linux-acpi@vger.kernel.org"><SPAN style="font-size: small;">linux-acpi@vger.kernel.org</SPAN></A><SPAN style="font-size: small;"> mailing list to receive support for Linux*/ACPI-related issues.<BR /><BR />==<BR />Lexi S.<BR />Intel Software Network Support<BR /><A href="http://www.intel.com/software" target="_blank">http://www.intel.com/software</A> <BR />Contact us: </SPAN><A href="http://www.intel.com/cd/ids/developer/asmo-na/eng/58987.htm"><SPAN style="font-size: small;"></SPAN></A><A href="http://www.intel.com/cd/ids/developer/asmo-na/eng/58987.htm" target="_blank">http://www.intel.com/cd/ids/developer/asmo-na/eng/58987.htm</A></SPAN><SPAN style="font-size: small;"> </SPAN></P> Sat, 24 Oct 2009 00:43:25 GMT https://community.intel.com/t5/Software-Archive/DVFS-modifying-the-processor-voltage/m-p/904575#M11314 Intel_Software_Netw1 2009-10-24T00:43:25Z