Date: Tue, 02 Aug 2005 10:59:41 -0700 From: ray@redshift.com To: freebsd-amd64@freebsd.org Cc: Martin Cracauer <cracauer@cons.org>, freebsd-amd64@freebsd.org Subject: Re: Benchmarks: AMD64 vs i386 on Dual 246 Opteron Message-ID: <3.0.1.32.20050802105941.00a547c8@pop.redshift.com> In-Reply-To: <20050802174922.GI71672@dragon.NUXI.org> References: <3.0.1.32.20050729020609.00a6a240@pop.redshift.com> <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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At 10:49 AM 8/2/2005 -0700, David O'Brien wrote: | 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) Thanks David - needless to say, I'm going to be re-running all my benchmarks :-D I can't remember if I left out the SMP line on the AMD kernel config or if I was thinking about the "device apic" line that is not needed. I was operating on about 2 hours of sleep and rushing to finish my benchmarks before the evaluation server had to be picked up by UPS. I'll post my results when I have another machine in here and re-run the exact same benchmarks. This time I will be certain to confirm the situation on the SMP kernel with regard to the AMD64 branch. Ray
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