Messages in this thread | | | Date | Thu, 24 Sep 2009 14:22:28 +0200 | From | Arjan van de Ven <> | Subject | Re: [v6 PATCH 0/7]: cpuidle/x86/POWER: Cleanup idle power management code in x86, cleanup drivers/cpuidle/cpuidle.c and introduce cpuidle to POWER. |
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On Thu, 24 Sep 2009 10:42:41 +0530 Arun R Bharadwaj <arun@linux.vnet.ibm.com> wrote:
> * Arun R Bharadwaj <arun@linux.vnet.ibm.com> [2009-09-22 16:55:27]: > > Hi Len, (or other acpi folks), > > I had a question regarding ACPI-cpuidle interaction in the current > implementation. > > Currently, every cpu (i.e. acpi_processor) registers to cpuidle as > a cpuidle_device. So every cpu has to go through the process of > setting up the idle states and then registering as a cpuidle device. > > What exactly is the reason behind this? >
technically a BIOS can opt to give you C states via ACPI on some cpus, but not on others.
in practice when this happens it tends to be a bug.. but it's technically a valid configuration
-- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org
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