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

[Nick Piggin]

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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