On Thu, Feb 22, 2007 at 01:52:57PM -0800, Venkatesh Pallipadi wrote: > Announcing 'cpuidle', a new CPU power management infrastructure to manage > idle CPUs in a clean and efficient manner. > cpuidle separates out the drivers that can provide support for multiple types > of idle states and policy governors that decide on what idle state to use > at run time. > A cpuidle driver can support multiple idle states based on parameters like > varying power consumption, wakeup latency, etc (ACPI C-states for example). > A cpuidle governor can be usage model specific (laptop, server, > laptop on battery etc). > Main advantage of the infrastructure being, it allows independent development > of drivers and governors and allows for better CPU power management. I played with this a little, and got puzzled. My quad core box used exactly the same amount of power whether the 'ladder' governer was loaded & in use or not. In both situations it was exactly the same as a vanilla 2.6.20 I'd have expected it to use more until I loaded up 'ladder' to bring it on par featurewise with 2.6.20. What did I miss? Dave -- http://www.codemonkey.org.uk - To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
