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    SubjectRe: [PATCH] improve rwsem scalability (was Re: [CFT][RFC] HT scheduler)


    Nick Piggin wrote:

    >
    >
    > Ingo Molnar wrote:
    >
    >> On Fri, 12 Dec 2003, Nick Piggin wrote:
    >>
    >>
    >>> getting contended. The following graph is a best of 3 runs average.
    >>> http://www.kerneltrap.org/~npiggin/rwsem.png
    >>>
    >>
    >> the graphs are too noise to be conclusive.
    >>
    >>
    >>> The part to look at is the tail. I need to do some more testing to see
    >>> if its significant.
    >>>
    >>
    >> yes, could you go from 150 to 300?
    >>
    >
    > The benchmark dies at 160 rooms unfortunately. Probably something in
    > the JVM.
    >
    > I'll do a larger number of runs around the 130-150 mark.
    >

    OK, this is an average of 5 runs at 145, 150, 155 rooms with my scheduler
    patches, with and without my rwsem patch. Its all over the place, but I
    think
    rwsem does give a small but significant improvement.

    http://www.kerneltrap.org/~npiggin/rwsem2.png

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