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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!news.mel.connect.com.au!munnari.OZ.AU!spool.mu.edu!sol.net!spool.mu.edu!newsspool.sol.net!howland.erols.net!usc!sdd.hp.com!hp-pcd.cv.hp.com!hplabs!news.sri.com!anemone.csl.sri.com!not-for-mail From: Fred Gilham <gilham@japonica.csl.sri.com> Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: ABIT IT5H slow mem bandwidth? Date: 07 Jun 1997 09:00:05 -0700 Organization: Computer Science Lab, SRI International Lines: 53 Message-ID: <u7d8py5rp6.fsf@japonica.csl.sri.com> References: <5naa9l$kdr@junkie.gnofn.org> NNTP-Posting-Host: japonica.csl.sri.com X-Newsreader: Gnus v5.3/Emacs 19.34 Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:42575 Craig Johnston writes: >The simple memory bandwidth benchmark: > >dd if=/dev/zero of=/dev/null bs=1m count=100 > >gives 86 mb/sec for the Asus w/PR133 and 60 mb/sec for the ABIT >w/PR166. > >What gives? The Asus is supposed to be slow, The ABIT fast, and the >ABIT has a faster CPU. This is a weird benchmark. Maybe it's more a test of cache size. pkg1:~ > dd if=/dev/zero of=/dev/null bs=1m count=100 100+0 records in 100+0 records out 104857600 bytes transferred in 0.934089 secs (112256533 bytes/sec) Pkg1 is a Pentium-133 with 512k of cache on a Super Micro board. japonica:~ > dd if=/dev/zero of=/dev/null bs=1m count=100 100+0 records in 100+0 records out 104857600 bytes transferred in 1.207309 secs (86852330 bytes/sec) Japonica is a (dual) Pentium-Pro 200 with 256k cache using a Super Micro board. impulse:~ > time dd if=/dev/zero of=/dev/null bs=1024k count=100 100+0 records in 100+0 records out 0.01u 2.32s 0:02.39 97.4% impulse:~ > (E.g. less than 50M/sec.) Impulse is a Sun Ultrasparc 1 at 167MhZ. I remember seeing some benchmark that showed that the Ultrasparcs had a higher memory bandwidth than P-Pros. Can anyone say what this benchmark is really testing? -- -Fred Gilham gilham@csl.sri.com ``The road to tyranny is paved with human rights....Once the state sets out to guarantee a right, it will destroy every obstacle that stands in the way of liberating the oppressed.'' --Thomas Fleming