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    SubjectRe: [PATCH] Prevent users from disabling tickless
    Date
    Matthew Wilcox <matthew@wil.cx> writes:

    > Disabling NO_HZ has a serious negative effect on performance -- an extra
    > 70us per I/O. Prevent users from deselecting it.

    This is rather non-trivial change.

    The common wisdom was that NO_HZ=y *adds* overhead, not removes it.
    Thus, I propose:

    (1) Retaining and elaborating the help text.
    (2) Allow user to change the default.


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