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Path: sserve!newshost.anu.edu.au!harbinger.cc.monash.edu.au!bunyip.cc.uq.oz.au!munnari.oz.au!news.hawaii.edu!ames!news.larc.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!jussieu.fr!univ-lyon1.fr!swidir.switch.ch!scsing.switch.ch!news.dfn.de!RRZ.Uni-Koeln.DE!se From: se@MI.Uni-Koeln.DE (Stefan Esser) Newsgroups: comp.os.386bsd.questions Subject: Re: NCR driver - speed problem Date: 6 Mar 1995 18:20:17 GMT Organization: Institute for Mathematics, University of Cologne, Germany Lines: 31 Message-ID: <3jfjp1$6oe@news.rrz.uni-koeln.de> References: <3j868m$1oj@dva.in-berlin.de> NNTP-Posting-Host: parc03.mi.uni-koeln.de In article <3j868m$1oj@dva.in-berlin.de>, paepcke@dva.in-berlin.de (Michael Paepcke) writes: |> Under DOS with this Hardware I have HardDisk Benchmarks: |> (Same Benchmarks under System 7 / Apple Mac) |> EMPIRE = 5 - 7 MB/sec |> But under FreeBSD 2.0(-cur) I have the following Benchmarks: |> EMPIRE = 3 - 4 MB/sec <----- Is this the whole drive, you were using ? Keep in mind, that DOS starts allocating disk blocks on the outer tracks (which are twice as fast as the inner tracks, on that drive), while BSD has a completely different allocation scheme, which effectively spreads data over many cylinder groups. This does improve throughput when the disk gets filled, but has a negative impact on performance when using very simple benchmarks. Or did you put a DOS partition on the outer tracks and used the remaining space for BSD ? Regards, STefan -- Stefan Esser Internet: <se@ZPR.Uni-Koeln.DE> Zentrum fuer Paralleles Rechnen Tel: +49 221 4706019 Universitaet zu Koeln FAX: +49 221 4705160 Weyertal 80 50931 Koeln