Date: Tue, 2 Aug 2005 10:49:22 -0700 From: "David O'Brien" <obrien@freebsd.org> To: ray@redshift.com Cc: Martin Cracauer <cracauer@cons.org>, freebsd-amd64@freebsd.org Subject: Re: Benchmarks: AMD64 vs i386 on Dual 246 Opteron Message-ID: <20050802174922.GI71672@dragon.NUXI.org> In-Reply-To: <3.0.1.32.20050729020609.00a6a240@pop.redshift.com> References: <3.0.1.32.20050728013152.00a4d188@pop.redshift.com> <3.0.1.32.20050728013152.00a4d188@pop.redshift.com> <3.0.1.32.20050729020609.00a6a240@pop.redshift.com>
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On Fri, Jul 29, 2005 at 02:06:09AM -0700, ray@redshift.com wrote: > In going over my notes, the only thing I > can see that might have been a mistake was if I left out 'options SMP' > from the AMD64 kernel config file. But I seem to recall you do not > have to include that on AMD64 like you do with i386 - can anyone > confirm this? Totally false! A kernel w/o 'options SMP' is a UP kernel and only uses a single CPU. I suspect is what you are mis-remembering is that an AMD64 SMP kernel will boot and work just fine on a UP AMD64 machine. (which hasn't been the case on i386 in the past) -- -- David (obrien@FreeBSD.org)
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