Date: Thu, 23 Sep 2010 23:56:31 -0700 From: John Theus <john@theusgroup.com> To: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: Re: SuperMicro i7 (UP) - very slow performance Message-ID: <20100924065636.BAF5E5F4C@theusgroup.com> In-Reply-To: <4C9B0F2C.20601@FreeBSD.org> References: <mailpost.1285173904.332223.70365.mailing.freebsd.stable@FreeBSD.cs.nctu.edu.tw> <mailpost.1285202775.8039756.86645.mailing.freebsd.stable@FreeBSD.cs.nctu.edu.tw> <4C9B0F2C.20601@FreeBSD.org>
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Alexander Motin wrote: >Just to compare, my Core i7-870 with boxed cooler reports: > 31C being idle with tuned power management, > 53C being idle without any power management, > 85C during `make -j16`. >That system did `make -j16 universe` in about 3 hours AFAIR. Another data point and a comment about temperatures. i5-650/H55, half the cores and about 60% the cost compared to the above. 8.1-STABLE amd64 make -j16 universe in 4 hours 5 minutes. all cores running at 100% according to top -P 30C idle 42C max during make I'm a EE and I used to make my living designing microprocessor-based computers. Our design standard for maximum chip temperature was 45C. Above that and the MTBF starts falling fast. Today's motherboards have a lot fewer components, so 45C is too low if you have a single motherboard, but not if you have 100. For the i7-870 above, the intel datasheet says at a maximum power of 95w, the maximum permitted temperature is 72.7C. For the i5-650 at 73w, the maximum permitted temperature is 66C. John Theus TheUsGroup.com
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