Date: Wed, 18 May 2005 11:44:13 -0700 From: Astrodog <astrodog@gmail.com> Cc: freebsd-amd64@freebsd.org Subject: Re: FreeBSD on dual core Opterons - stupid buildworld test Message-ID: <2fd864e05051811442152fa@mail.gmail.com> In-Reply-To: <200505181441.39457.jkim@niksun.com> References: <428B6FC1.3000907@fsn.hu> <1116437340.69035.0.camel@hood.oook.cz> <20050518180521.GB9719@odin.ac.hmc.edu> <200505181441.39457.jkim@niksun.com>
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On 5/18/05, Jung-uk Kim <jkim@niksun.com> wrote: > On Wednesday 18 May 2005 02:05 pm, Brooks Davis wrote: > > On Wed, May 18, 2005 at 07:29:00PM +0200, Pav Lucistnik wrote: > > > Attila Nagy p=ED?e v st 18. 05. 2005 v 18:39 +0200: > > > > Hello, > > > > > > > > I did some buildworld tests on an HP BL45p with 4 2,2 GHz > > > > Opterons. > > > > > > > > Sequential time make buildworld -jX times (if there is a > > > > missing iteration, then the build has failed): > > > > > > > > http://people.fsn.hu/~bra/bl45p/dmesg.boot > > > > > > > > Hyperthreading: 2 logical CPUs > > > > > > So dual-core Opterons report into system as Hyperthreading? > > > Uncool. > > > > What the AMD reps said at a session I attended last year is that > > they report as supporting hyper threading, but set another bit to > > say that they are actually real cores. We probably need to find > > out what that bit is. >=20 > FYI, Linux says: >=20 > http://lxr.linux.no/source/include/asm-x86_64/cpufeature.h#L78 > http://lxr.linux.no/source/arch/x86_64/kernel/setup.c#L834 >=20 > Jung-uk Kim >=20 Opteron reports Hyperthreading, because it tries to take advantage of the licencing benifit. Keep in mind, HT P4s are counted as a single CPU for the most part, in a licence. Opteron may not. By acting as though its a HT processor, it gets that same benifit.
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