Date: Wed, 22 May 2002 11:51:02 -0700 From: Alfred Perlstein <bright@mu.org> To: Terry Lambert <tlambert2@mindspring.com> Cc: "Dorr H. Clark" <dclark@applmath.scu.edu>, freebsd-smp@FreeBSD.ORG Subject: Re: hyperthreading: myth or legend? (was Re: hyperthreading? (was Re: question)) Message-ID: <20020522185102.GY54960@elvis.mu.org> In-Reply-To: <3CEBE6FD.626DC5DD@mindspring.com> References: <20020514222840.GB1585@elvis.mu.org> <Pine.GHP.4.21.0205220940410.28331-100000@hpux38.dc.engr.scu.edu> <20020522172759.GV54960@elvis.mu.org> <3CEBE6FD.626DC5DD@mindspring.com>
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* Terry Lambert <tlambert2@mindspring.com> [020522 11:44] wrote: > > > > I'm glad you chose to take the word of a couple of people > > that have never used a hyperthreading board above what I've > > already told you. > > > > Here's what I know: > > The additional CPUs probe. > > > > A benchmarking utility reports equivelant performance to a 4 way > > machine. > > According to the Intel documentation I read, hyperthreading is not > the same thing as simply having the extra CPUs on the same die (which > is what you seem to be implying it is). Here is the reference: > > http://www.intel.com/design/Xeon/Whitepaper/WhitepaperNBHT.htm > Terry, it boots and probes as a 4way box with 2 cpus. I'm sure the listed optimizations you provided would be of some assistance however I HAVE seen it boot and probe as a 4way. -- -Alfred Perlstein [alfred@freebsd.org] 'Instead of asking why a piece of software is using "1970s technology," start asking why software is ignoring 30 years of accumulated wisdom.' Tax deductible donations for FreeBSD: http://www.freebsdfoundation.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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