Date: Thu, 15 Apr 2010 13:28:34 +0900 (JST) From: Maho NAKATA <chat95@mac.com> To: smithi@nimnet.asn.au Cc: amvandemore@gmail.com, freebsd-stable@freebsd.org, alc@freebsd.org, alan.l.cox@gmail.com, avg@freebsd.org, yanefbsd@gmail.com, als@modulus.org Subject: Re: HyperThreading makes worse to me Message-ID: <20100415.132834.229420430668646074.chat95@mac.com> In-Reply-To: <20100415135034.J52200@sola.nimnet.asn.au> References: <n2i7d6fde3d1004141949z2689a81cwf8c48805ea09d68@mail.gmail.com> <k2x7d6fde3d1004141950t81b4214awddea4563182526c5@mail.gmail.com> <20100415135034.J52200@sola.nimnet.asn.au>
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From: Ian Smith <smithi@nimnet.asn.au> Subject: Re: HyperThreading makes worse to me (was Re: How to reproduce= : Re: Only 70% of theoretical peak performance on FreeBSD 8/amd64, Core= i7 920) Date: Thu, 15 Apr 2010 14:21:30 +1000 (EST) > Er, shouldn't one of those say HTT on? and/or Turbo boost on? Else = > they're both the same test as [4] but with different results? sorry, Turbo Boost off, Hyper threading off: 82% (35GFlops) =A0 =A0[1] Turbo Boost off, Hyper threading on: 72% (30.5GFlops) =A0[2] HTT on performs always worse. > Clarification of all four possible test configs - 8 if you add pinnin= g = > CPUs or not - might make this a bit clearer? right. Pinning might not be so important I guess. Core i7 is not NUMA. Thanks, -- Nakata Maho http://accc.riken.jp/maho/ , JA OOO http://ja.openoffice= .org/ Blog: http://blog.goo.ne.jp/nakatamaho/ , GPG key: http://accc.riken= .jp/maho/maho.pgp.txt
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