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    SubjectRe: [PATCH] i386 No Idle HZ aka dynticks 051221

    On Sun, Dec 25, 2005 at 09:55:26PM -0500, Theodore Ts'o wrote:
    > Looking at acpi/processor_idle.c, there is all sorts of magic special
    > cases code for the C2 and C3 states (both for promotion/demotion
    > polcies, as well as what to do when idling in those particular
    > states), and which doesn't exist for other states, such as C4.

    The magic is for C2- and C3-_type_ sleep, and C4 is of type C3... I know,
    this numbering is very confusing, but that's the way it is... However, the
    sepcially added "magic" for dyntick still needs some tweaking; I'll try to
    improve (and hopefully streamline) it a bit. As a first test, could you
    remove the "Fast-path demotion" case and re-test?

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