Re: 2.4.17-pre2+ext3-0.9.16+anton's cache aligned smp

From: Daniel Phillips (phillips@bonn-fries.net)
Date: Fri Dec 07 2001 - 10:27:27 EST

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In reply to: Andrew Morton: "Re: 2.4.17-pre2+ext3-0.9.16+anton's cache aligned smp"
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On December 6, 2001 09:45 am, Andrew Morton wrote:
> Yusuf Goolamabbas wrote:
> >
> > Running 2.4.17-pre2 + ext3-0.9.16 + Anton Blanchards
> > cacheline_aligned_smp patch available at
> >
> > http://samba.org/~anton/linux/cacheline_aligned/
>
> omigod look at that graph.
>
> Excuse me while I get frustrated. Will someone *please* send that
> damn patch to marcelo@conectiva.com.br?
>
> (It can be improved further by putting padding *behind* the lock
> but hey).
>
> > ...
> >
> > With Anton's patch, the number of ctx-swtch/sec drops by around 3000
> > from avg of 9000 (for 17-pre2+ext3) to avg of 6000 (with anton) as seen
> > by vmstat 1
>
> Really? The spinlock cacheline alignment alone made that
> difference? I wonder why.

Before getting *too* excited, remember, it's dbench, so effects could easily
be magnified. Maybe test with something better behaved?

--
Daniel
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