Messages in this thread | | | From | Serge Belyshev <> | Subject | Re: [PATCH] Prevent users from disabling tickless | Date | Sun, 02 Jan 2011 10:59:38 +0000 |
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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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