Date: Thu, 15 Apr 2010 09:47:33 +0900 (JST) From: Maho NAKATA <chat95@mac.com> To: amvandemore@gmail.com Cc: alc@freebsd.org, alan.l.cox@gmail.com, freebsd-stable@freebsd.org, als@modulus.org, avg@freebsd.org Subject: Re: How to reproduce: Re: Only 70% of theoretical peak performance on FreeBSD 8/amd64, Corei7 920 Message-ID: <20100415.094733.575506241433873719.chat95@mac.com> In-Reply-To: <m2y6201873e1004140945n855c8800we9baced2e293f270@mail.gmail.com> References: <4BC5DEB4.1090208@freebsd.org> <x2k6201873e1004140934z6f7518b9j72ffd9e1adc1ad49@mail.gmail.com> <m2y6201873e1004140945n855c8800we9baced2e293f270@mail.gmail.com>
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opps I missed this e-mail... From: Adam Vande More <amvandemore@gmail.com> Subject: Re: How to reproduce: Re: Only 70% of theoretical peak performance on FreeBSD 8/amd64, Corei7 920 Date: Wed, 14 Apr 2010 11:45:04 -0500 > On Wed, Apr 14, 2010 at 11:34 AM, Adam Vande More <amvandemore@gmail.com>wrote: > >> >> >> >> That's about 67% utilization, turning off HTT drops it more. HTT on the >> newer cores is good, not bad. >> > > Well that was completely contrarty to some tests I'd run when I first got > the cpu. > > With HTT off: > > n: 3000 > time : 44.705516 or 11.760183 > Mflops : 45932.959253 > n: 3100 > time : 50.598581 or 14.270123 > Mflops : 41766.437458 > n: 3200 > time : 55.748192 or 15.780977 > Mflops : 41541.458400 > n: 3300 > time : 62.072217 or 17.441431 > Mflops : 41221.262070 > n: 3400 > > so that's about 79% right there. > > also if I run cpuset on the dgemm then the utilization is basically at the > theoretical max for one core so at least that part is working. > > -- > Adam Vande More
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