CentOS 5.2 + Xen で powernow-k8 その2

linux

cpufreq=dom0-kernelでDom0からcpufreq-info、cpufreq-selectorなどが使えるようになった。

title CentOS (2.6.18-92.1.10.el5xen)
        root (hd0,0)
        kernel /boot/xen.gz-3.3.0 cpufreq=dom0-kernel
        module /boot/vmlinuz-2.6.18-92.1.10.el5xen ro root=/dev/md0
        module /boot/initrd-2.6.18-92.1.10.el5xen.img
# modprobe cpufreq_conservative
# cpufreq-selector -g conservative
# cpufreq-info 
cpufrequtils 002: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to linux@brodo.de, please.
analyzing CPU 0:
  driver: powernow-k8
  CPUs which need to switch frequency at the same time: 0
  hardware limits: 1000 MHz - 2.20 GHz
  available frequency steps: 2.20 GHz, 2.00 GHz, 1.80 GHz, 1000 MHz
  available cpufreq governors: conservative, powersave, userspace, performance
  current policy: frequency should be within 1000 MHz and 2.20 GHz.
                  The governor "conservative" may decide which speed to use
                  within this range.
  current CPU frequency is 1000 MHz (asserted by call to hardware).

たぶん有効になってるんじゃないかと思います。たぶん。

ついでに低電圧化 - winplusの日記，powernow-k8の再コンパイル（電圧変更） - winplusの日記あたりを試してみると面白いかも。