Date: Fri, 4 Feb 2005 15:58:28 -0500 From: John Baldwin <jhb@FreeBSD.org> To: amd64@FreeBSD.org Cc: peter@FreeBSD.org Subject: [PATCH] Change atomic operations to use fences for memory barriers Message-ID: <200502041558.28521.jhb@FreeBSD.org>
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The patch below changes the atomic operations on amd64 to use the cheaper fence instructions for memory barriers. I'd like people to test it to see if 1) it breaks things or not, and 2) if it impacts performance either in a good way or a bad way. For this last I'm curious about both UP and SMP as my initial guess is that it will help on UP but might hurt on SMP. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
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