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Date: Thu, 06 Dec 2001 00:45:17 -0800
From: Andrew Morton <akpm@zip.com.au>
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To: Yusuf Goolamabbas <yusufg@outblaze.com>
CC: ext3-users@redhat.com, linux-kernel@vger.kernel.org, anton@samba.org,
        axboe@suse.de
Subject: Re: 2.4.17-pre2+ext3-0.9.16+anton's cache aligned smp
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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.


Thanks for testing.

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