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Date: Wed, 21 Sep 2005 13:45:04 +0200
From: Martin Nilsson <martin@gneto.com>
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To: John Baldwin <jhb@FreeBSD.org>
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Cc: amd64@FreeBSD.org
Subject: Re: Patch to use fence instructions
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John Baldwin wrote:
> This patch changes the atomic operations and bus space barriers to use the x86 
> fence instructions.  Please test, thanks!
> 
> http://www.FreeBSD.org/~jhb/patches/amd64_fences.patch

What kind of performance improvements can we expect with this patch?
Is it worthwile to compare performance on dualcore Pentium D with 
sysbench before and after this patch? Does it affect threads & mutex 
performance?

Sysbench is a benchmark specially made to determine lowlevel performance 
important for MySQL and be found here: http://sysbench.sourceforge.net/

/Martin