Sir, I am working on power consumption anaysis of different machines we have in our lab ( servers, power pcs). I came to know about powertop for power analysis. till now, I have used it on my laptop only and analyse power when laptop is on battery and connected to power also(plugged). Now I have to move on servers etc. There are some questions in my mind and searched a lot but stilled confused. Please guide me about these questions. 1. Can powertop be used on PCs and servers ( having backups or not) 2. I experiment it and it worked on servers but watts etc colunm is not appeared that's what I main problem. 3. How watts etc can be appeared on powertop when running on servers. 4.If I sum all the power usage (watts etc colunm) on my laptop when plugged. Is that value total power comsumed on my system. 5. How much accurate powertop is(%). 6. What is working principle of powertop i.e. from where it get informations about power usage.Is it read some specific registers? If you donot want to give the answer of this question then just inform me a littlebit. I am a student and not belong to a big company. 7. I want to know can I use powertop for mips( octeon) linux system. I have tried to install. It is completed but when I launch It, it shows nothing but says following No detailed statistics available; please enable the CONFIG_TIMER_STATS kernel option This option is located in the Kernel Debugging section of menuconfig (which is CONFIG_DEBUG_KERNEL=y in the config file) Note: this is only available in 2.6.21 and later kernels Suggestion: Enable the CONFIG_NO_HZ kernel configuration option. This option is required to get any kind of longer sleep times in the CPU. How to solve it. what is this Please reply Regards Shafiq