Date: Sat, 18 May 2013 16:09:31 +0200 From: Michio Honda <micchie@sfc.wide.ad.jp> To: current@freebsd.org Subject: Changing CPU frequency for Xeon processors Message-ID: <1280DF1A-1DAC-43F1-A62D-B4DC9378FF88@sfc.wide.ad.jp>
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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=3D773: Device not configured"). Do you have any idea to change CPU frequency for this CPU? Cheers, - Michio
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