Take a look at the slides (around 29): http://www.cs.utexas.edu/users/cart/arch/beeman.ppt Should be able to control individual cores freqs/Cstates. (Unless I'm reading them wrong.) But if this is handled by the ACPI drivers maybe I'm looking in the wrong space. Thanks, --Mike On Fri, 2009-03-13 at 04:51 +0000, Matthew Garrett wrote: > On Thu, Mar 12, 2009 at 11:44:56AM -0600, michael k lang wrote: > > > I would like to be able to put a single core to the C6 state. Also to > > set individual frequency of cores in a socket. > > C states are handled by the ACPI processor driver, not the cpufreq > driver. They're a function of the idle loop in the kernel - a CPU in a C > state other than C0 can't execute code. To the best of my knowledge, > it's not possible to set the frequency of individual cores in a package. > The primary reason to alter frequency is to be able to drop the core > voltage, and Intel's architecture fixes the voltage per package. > Dropping the frequency of an individual core rather than the entire > package wouldn't save power. > -- To unsubscribe from this list: send the line "unsubscribe cpufreq" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
