On Fri, 2020-01-31 at 11:07 +0000, David Laight wrote: > Unless you know exactly which cpu table is being used the > only constraint a user can request is the latency. Hi David, in all my use-cases I always know what is the CPU I am dealing with and what are the C-states. Simply because in my view they are always CPU- dependent in terms of what they do and how are they named. What you say sounds to me like you would want to disable some C-states without knowing anything (or much) about the CPU you are dealing with and the C-state names. If so, could you please share examples of such use-cases? Thanks! -- Best Regards, Artem Bityutskiy