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Xref: sserve comp.os.386bsd.misc:4319 alt.folklore.computers:69147 Path: sserve!newshost.anu.edu.au!harbinger.cc.monash.edu.au!aggedor.rmit.EDU.AU!europa.eng.gtefsd.com!hookup!ames!newsfeed.gsfc.nasa.gov!news!kstailey From: kstailey@leidecker.gsfc.nasa.gov (Kenneth Stailey) Newsgroups: comp.os.386bsd.misc,alt.folklore.computers Subject: Re: BSD sluggish compared to Linux? Followup-To: comp.os.386bsd.misc,alt.folklore.computers Date: 06 Dec 1994 17:07:35 GMT Organization: NASA Goddard Space Flight Center -- Greenbelt, Maryland USA Lines: 14 Message-ID: <KSTAILEY.94Dec6120735@leidecker.gsfc.nasa.gov> References: <3am248$7kv@itu1.sun.ac.za> <3ao31t$9fo@itu1.sun.ac.za> <1994Nov21.000855.124757@slate.mines.colorado.edu> <3atqbj$9u5@muise.hookup.net> <Czq128.506@bonkers.taronga.com> <3b0ut5$637@itu1.sun.ac.za> <3bbi0r$dff@muise.hookup.net> <Pine.OSF.3.91.941128105220.32580A-100000@broken.isltd.insignia.com> <3bj6cc$khg@cray.bitcon.no> <3bk788$prr@itu1.sun.ac.za> NNTP-Posting-Host: leidecker.gsfc.nasa.gov Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit In-reply-to: arichfld@cs.sun.ac.za's message of 1 Dec 1994 10:07:04 GMT If you have SCSI disks under NetBSD you can improve the performance by [1] setting maxcontig to at least 8 (default is 1) to enable clustering (this can be using "tunefs") [2] setting rotational delays to 0 (must use newfs, sigh) [3] setting number of rotational positions to 1 (ditto) If you use newfs you must of course backup & reinstall everything. The options to get all three are "-a 8 -d 0 -n 1". This probably applies to other BSD's too. The problem is that you don't really know with any certainty exactly where a given disk block is on a SCSI drive since you only talk to the controller.