Mark.Haywood at Sun.COM wrote: > So this brings up a question that I think I've asked before > and not seen > an answer to. The discussion here seems to be around a C-state driver, > not a CPU driver? Does this mean that the C-state support will be in a > driver of its own? Or is it going to be functionality provided by the > CPU driver? > C-state support will be in a driver similar as speedstep driver, they both are included in the CPU driver. The driver will parse ACPI tables, evaluate _CST object and cache its data, give a interface to the high level OSPM to change the c-state through io port, and have a policy to decide which c-state the processor should go into in the next idle, according to the latency read from _CST.
Thanks, -Aubrey
