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Path: sserve!newshost.anu.edu.au!harbinger.cc.monash.edu.au!msunews!agate!howland.reston.ans.net!news.sprintlink.net!helena.MT.net!nate From: nate@trout.sri.MT.net (Nate Williams) Newsgroups: comp.unix.bsd Subject: Re: Linux vs. BSD?! Date: 20 Feb 1995 19:48:07 GMT Organization: SRI Intl. - Montana Lines: 42 Message-ID: <3iarln$9s0@helena.MT.net> References: <3i7ar8$ahv@marton.hsr.no> <3i83js$avl@ivory.lm.com> <3iaaai$72u@agate.berkeley.edu> <3iab0s$hjl@ivory.lm.com> Reply-To: "Nate Williams" <nate@sneezy.sri.com> NNTP-Posting-Host: trout.sri.mt.net In article <3iab0s$hjl@ivory.lm.com>, Peter Berger <peterb@telerama.lm.com> wrote: >These were run on identical hardware. The benchmark is Dhrystone 2.1, >which is more reliable than the 1.1 version I noticed others using as it >is less affected by secondary cache. > >Here's the table. 1,000,000 runs through Dhrystone in each case. > >Machine OS One Ds (musec.) Ds/sec >======= ============ =============== ====== >Blindman FreeBSD2.0-R 36.0 27,790.6 >Blindman BSD/OS 1.1 27.9 35,820.9 >Blindman NetBSD 1.0-R 27.8 36,014.4 Hmm, using the HZ value mentioned in a previous article, and my trusty HP calculator and the 25% error rate mentioned due to HZ value differences in NetBSD and FreeBSD. (FreeBSD uses a larger number to get more accurate profiling information) 36.0 * .75 = 27 36014.4 * .75 = 27010.8 Hmm, those look awfully similar to the numbers reported by FreeBSD/NetBSD if there is indeed a discrepancy (which I am asserting). I believe the #'s are 100 HZ vs 128 HZ, but I don't have the information handy so I can't say for sure. To be completely honest, when #'s are this far out of whack for benchmarks that compare CPU performance, you need to suspect that something is wrong. You should get 'similar' results on ANY OS running on the same hardware with whetstone and dhrystone since it's a function of the CPU, and not of the underlying OS. SCO, Linux, Solaris, NeXTStep, DOS, FreeBSD, NetBSD, or BSD/386 shouldn't have that much difference. Nate -- nate@FreeBSD.org | Do you think SRI cares what I say? They certainly nate@sneezy.sri.com | don't accept responsibility for my actions, so I work #: (406) 449-7662 | obviously don't represent them on Usenet. home #: (406) 443-7063 | *FreeBSD core member and all around tech. weenie*