Date: Wed, 22 Sep 2010 15:17:29 +0100 From: Tom Evans <tevans.uk@googlemail.com> To: Ian Smith <smithi@nimnet.asn.au> Cc: Adam Vande More <amvandemore@gmail.com>, Bryce <bryce@bryce.net>, freebsd-stable@freebsd.org, Peter Jeremy <peterjeremy@acm.org> Subject: Re: SuperMicro i7 (UP) - very slow performance Message-ID: <AANLkTik3bFuh9FR8vvwf=FfO2ojQYzHxWD8MODj22x1a@mail.gmail.com> In-Reply-To: <20100922230552.D11124@sola.nimnet.asn.au> References: <AANLkTin2XH8Gs0ytgHsuF50iUJ3JFQU_OO3xSRfq3-C8@mail.gmail.com> <mailpost.1284981513.7745206.53335.mailing.freebsd.stable@FreeBSD.cs.nctu.edu.tw> <10b0bdef-2bb1-44c8-9ffb-7d3167147a4f@q2g2000vbk.googlegroups.com> <20100922081230.GA20489@server.vk2pj.dyndns.org> <20100922230552.D11124@sola.nimnet.asn.au>
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On Wed, Sep 22, 2010 at 2:50 PM, Ian Smith <smithi@nimnet.asn.au> wrote: > It seems far more than just CPU performance is awry. Adam's data from > his i7 shows 2.7 times Bryce's speed for the md5 -t, maybe a lower EST > rate? - but that could no way account for buildworld taking 22.5 hours. > > Recent buildworld (albeit i386) on my Thinkpad T23 ran just shy of 3.5 > hours, without -j on an 1133MHz P3-M, 768MB of 133MHz RAM, 5400rpm UFS > disk - with X/KDE running meanwhile (~5-7% CPU penalty). > > cheers, Ian md5 -t is quite a small benchmark, even with his misfunctioning CPU it took <6 seconds to complete. If his problem is a misapplied heatsink/fan, then his CPU could be throttling when it gets hot, the hotter it gets the more it throttles, which could explain his massive buildworld walltime. Perhaps running something like: apply -0 "md5 -t" `jot 10` would display a notable difference. Intel chips are quite good at running without much cooling and not dieing, using thermal throttling to preserve the CPU. Cheers Tomhome | help
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