Date: Fri, 04 Feb 2005 15:29:36 -0700 From: Scott Long <scottl@freebsd.org> To: John Baldwin <jhb@freebsd.org> Cc: peter@freebsd.org Subject: Re: [PATCH] Change atomic operations to use fences for memory barriers Message-ID: <4203F750.1060102@freebsd.org> In-Reply-To: <200502041558.28521.jhb@FreeBSD.org> References: <200502041558.28521.jhb@FreeBSD.org>
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John Baldwin wrote: > 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. > I think you forgot the patch. Scott
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