Date: Sat, 18 May 2013 16:07:24 -0400 From: Eric van Gyzen <eric@vangyzen.net> To: Michio Honda <micchie@sfc.wide.ad.jp> Cc: current@freebsd.org Subject: Re: Changing CPU frequency for Xeon processors Message-ID: <5197DF7C.1040305@vangyzen.net> In-Reply-To: <1280DF1A-1DAC-43F1-A62D-B4DC9378FF88@sfc.wide.ad.jp> References: <1280DF1A-1DAC-43F1-A62D-B4DC9378FF88@sfc.wide.ad.jp>
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On 05/18/2013 10:09 AM, Michio Honda wrote: > Hi, > > I'm trying to experiment with downclocking CPU. > My environment is 10.0-CURRENT amd64. > > However, my CPU (Xeon E31220) seems not to be supported by the cpufreq module, thus dmesg shows: > est0: <Enhanced SpeedStep Frequency Control> on cpu0 > est: CPU supports Enhanced Speedstep, but is not recognized. > > As a result, although sysctl -a shows the list of available frequency values (dev.cpu.0.freq_levels: 3093/-1 2706/-1 2319/-1 1933/-1 1546/-1 1159/-1 773/-1 386/-1 > dev.), I cannot set the value (the error message is "sysctl: dev.cpu.0.freq=773: Device not configured"). > > Do you have any idea to change CPU frequency for this CPU? In my experience, the "not recognized" message indicates that the feature is not enabled in the BIOS. Eric
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