Date: Wed, 21 Sep 2005 13:45:04 +0200 From: Martin Nilsson <martin@gneto.com> To: John Baldwin <jhb@FreeBSD.org> Cc: amd64@FreeBSD.org Subject: Re: Patch to use fence instructions Message-ID: <433147C0.8030900@gneto.com> In-Reply-To: <200509201616.22475.jhb@FreeBSD.org> References: <200509201616.22475.jhb@FreeBSD.org>
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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
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