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    SubjectRe: [PATCH] x86: Reduce the default HZ value
    On Tue, 5 May 2009, Alan Cox wrote:

    > HZ on a tickless system has no meaningful relationship to wakup rates -
    > which are what I assume you actually care about.

    Linux is not tickless. It only switches off ticks if a processor is idle.

    > So do you want to change the precision of poll() and other
    > functionality ? or do you want to change the wakeup rates and
    > corresponding virtualisation overhead ?

    select and poll use timeouts based on high resolution timers.

    > What measurements have you done that make you think HZ is relevant in a
    > tickless kernel ?

    Just reading the code gets you there.




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