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    SubjectRe: dynamic-hz
    On Sun, Dec 12, 2004 at 05:35:47PM +0100, Pavel Machek wrote:
    > It certainly helps with singing capacitors... What is overhead of

    ;)

    > this?

    The overhead is a single l1 cacheline in the paths manipulating HZ
    (rather than having an immediate value hardcoded in the asm, it reads it
    from a memory location not in the icache). Plus there are some
    conversion routines in the USER_HZ usages. It's not a measurable
    difference.
    -
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