Date: Wed, 14 Apr 2010 11:45:04 -0500 From: Adam Vande More <amvandemore@gmail.com> To: Andriy Gapon <avg@freebsd.org> Cc: alc@freebsd.org, Maho NAKATA <chat95@mac.com>, alan.l.cox@gmail.com, freebsd-stable@freebsd.org, als@modulus.org Subject: Re: How to reproduce: Re: Only 70% of theoretical peak performance on FreeBSD 8/amd64, Corei7 920 Message-ID: <m2y6201873e1004140945n855c8800we9baced2e293f270@mail.gmail.com> In-Reply-To: <x2k6201873e1004140934z6f7518b9j72ffd9e1adc1ad49@mail.gmail.com> References: <h2yca3526251004122230l909bc93ey916d7fe0dd24fd33@mail.gmail.com> <4BC402B7.5000400@modulus.org> <v2gca3526251004122322i709c523ct4f93bcf75a778a8e@mail.gmail.com> <20100414.082109.29593248145846106.chat95@mac.com> <4BC5DEB4.1090208@freebsd.org> <x2k6201873e1004140934z6f7518b9j72ffd9e1adc1ad49@mail.gmail.com>
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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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