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Newsgroups: comp.os.386bsd.questions Path: sserve!newshost.anu.edu.au!munnari.oz.au!news.Hawaii.Edu!ames!elroy.jpl.nasa.gov!swrinde!cs.utexas.edu!uunet!math.fu-berlin.de!informatik.tu-muenchen.de!wiserner From: wiserner@Informatik.TU-Muenchen.DE (Bernd Wiserner) Subject: Re: DISK LIGHT HANG !#@*&!!! References: <1993Nov3.190751.17591@sifon.cc.mcgill.ca> <1993Nov8.015518.23306@news.qut.edu.au> <hastyCG75y8.730@netcom.com> Sender: news@Informatik.TU-Muenchen.DE (USENET Newssystem) Organization: Technische Universitaet Muenchen, Germany Date: Tue, 9 Nov 1993 01:02:12 GMT Message-ID: <1993Nov9.010212.4807@Informatik.TU-Muenchen.DE> Lines: 41 In article <hastyCG75y8.730@netcom.com> hasty@netcom.com (Amancio Hasty Jr) writes: >Three things: > >The bsd drivers don't use DMA > >Many times the geometry layout of the disk is not optimized sometimes >you can get a four fold improvement by just properly fine tuning your >file system. A nice item for a FAQ. > >Memory, the more that you have the merrier it is. At work I have >20MB of memory and I don't have any problems running X and compiling >large C++ programs. I strongly suspect that compiling X on my 486DX33 >is faster than on my sparc II with a scsi. Complete X on a sparc : 3.5 hours Complete X on a 486DX50 : 1.9 hours. > >-------- > >There is a new generation of scsi disk drives with higher RPM be in the >look out for them. I think that IBM is selling one a 1GB with 5400 RPM and One thing wich really increases throughput is the bsize-field in the disklabel. Increasing it from 4 to 8 kb -> 240 kb read-speed increased to over 800 kB. >I saw listed here in Silicon Valley for $1000. There should be better prices. ( 800 ?! ) I saw a Toshiba for $720 ... > >If memory does not failed the more traditional scsi drives are about 3600 RPM. > >VLB and EISA can help you but I suspect that the kernel needs more work. > >Amancio > > > >-- >This message brought to you by the letters X and S and the number 3 >Amancio Hasty | >Home: (415) 495-3046 | ftp-site depository of all my work: >e-mail hasty@netcom.com | sunvis.rtpnc.epa.gov:/pub/386bsd/X B.Wiserner