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

[Nick Piggin]

Nick Piggin wrote:

> Nick Piggin wrote:
>
> > 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


What do you think? Is there any other sorts of benchmarks I should try?
The improvement I think is significant, although volanomark is quite
erratic and doesn't show it well.

I don't see any problem with moving the wakeups out of the rwsem's spinlock.


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