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I'm currently working on Ubuntu 12.04 x64. A lot of manuals about power saving in Linux tells about using parameters /sys/devices/system/cpu/sched_mc_power_savings and /sys/devices/system/cpu/sched_smt_power_savings, but they don't exists in my OS. Is it about 3.X kernel improvements? Is there any similar ways of turning CPU scheduling in power save mode on Ubuntu 12.04?

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That is strange -- sched_mc_power_savings seems to exist on my system. I am running 12.04 x64, fairly vanilla install. What are the contents of your /sys/devices/system/cpu directory? Mine looks like the following:

mike@cobbler:~$ ls -la /sys/devices/system/cpu/
total 0
drwxr-xr-x 6 root root    0 Aug  5 15:21 .
drwxr-xr-x 7 root root    0 Aug  5 15:21 ..
drwxr-xr-x 6 root root    0 Aug  5 15:21 cpu0
drwxr-xr-x 6 root root    0 Aug  5 15:21 cpu1
drwxr-xr-x 3 root root    0 Aug  5 15:21 cpufreq
drwxr-xr-x 2 root root    0 Aug  5 15:21 cpuidle
-r--r--r-- 1 root root 4096 Aug  5 17:04 kernel_max
-r--r--r-- 1 root root 4096 Aug  5 17:04 offline
-r--r--r-- 1 root root 4096 Aug  5 15:21 online
-r--r--r-- 1 root root 4096 Aug  5 17:04 possible
-r--r--r-- 1 root root 4096 Aug  5 15:36 present
--w------- 1 root root 4096 Aug  5 17:04 probe
--w------- 1 root root 4096 Aug  5 17:04 release
-rw-r--r-- 1 root root 4096 Aug  5 15:21 sched_mc_power_savings
  • ls -a /sys/devices/system/cpu/ . cpu0 cpufreq kernel_max online present release .. cpu1 cpuidle offline possible probe – kmedv Aug 6 '12 at 9:14

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