Date: Tue, 20 Nov 2007 21:09:53 +0000 From: Bob Bishop <rb@gid.co.uk> To: Kris Kennaway <kris@freebsd.org> Cc: Attilio Rao <attilio@freebsd.org>, freebsd-stable@freebsd.org, Alexey Popov <lol@chistydom.ru> Subject: Re: 2 x quad-core system is slower that 2 x dual core on FreeBSD Message-ID: <97FEA818-B54F-4981-A0A4-440D1DF5AB7A@gid.co.uk> In-Reply-To: <47432F77.3030606@FreeBSD.org> References: <4741905E.8050300@chistydom.ru> <fhs3s5$knj$1@ger.gmane.org> <47419AB3.5030008@chistydom.ru> <fhs7hp$2es$2@ger.gmane.org> <4741A7DA.2050706@chistydom.ru> <4741DA15.9000308@FreeBSD.org> <47429DB8.7040504@chistydom.ru> <4742ADFE.40902@FreeBSD.org> <4742C46A.1060701@chistydom.ru> <47432F77.3030606@FreeBSD.org>
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Hi, FWIW, we are seeing 2 x quad-core 2.66GHz outperform (per core) 2 x dual-core 3GHz on the same type of m/b, apparently because of better bandwidth to memory. However, this is on a compute-intensive workload running 1 job per core so would be pretty insensitive to scheduler/ locking issues. -- Bob Bishop +44 (0)118 940 1243 rb@gid.co.uk fax +44 (0)118 940 1295
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