Return to BSD News archive
Path: sserve!newshost.anu.edu.au!munnari.oz.au!bunyip.cc.uq.oz.au!harbinger.cc.monash.edu.au!msuinfo!agate!howland.reston.ans.net!europa.eng.gtefsd.com!emory!cherry.atlanta.com!nntp.mindspring.com!usenet From: rsanders@mindspring.com (Robert Sanders) Newsgroups: comp.os.386bsd.questions Subject: Re: How to get better SCSI performance? [FreeBSD 1.1R/AHA1542Cf] Date: 20 Jun 1994 00:06:51 GMT Organization: MindSpring Enterprises, Inc. Lines: 20 Message-ID: <RSANDERS.94Jun19200651@hrothgar.mindspring.com> References: <CrKBr2.8oJ@mozo.cc.purdue.edu> <Z2zQYYR.dysonj@delphi.com> <CrM6Ko.qFy@mozo.cc.purdue.edu> <michaelv.772064913@ponderous.cc.iastate.edu> NNTP-Posting-Host: msdem5.mindspring.com In-reply-to: michaelv@iastate.edu's message of 19 Jun 94 22:28:33 GMT In article <michaelv.772064913@ponderous.cc.iastate.edu> michaelv@iastate.edu (Michael L. VanLoon) writes: >This gives me about 700K/s, which still isn't very good... Even the >slower of the two drives did 1.5M/s sustained when it was connected to >an Amiga... I'd like to get some of that back. :-) You mentioned in your original post that you tested it with iozone. You do realize iozone tests performance *through* the filesystem? I would bet 10-1 that your Amiga test program tested the raw disk. The figures will always be very different, since testing the raw disk measures only the hardware performance. Iozone measures the hardware, *plus* the efficiency of the filesystem code. This will *always* be slower. Um, well, if he's getting 1/2 disk throughput with his filesystem, he's not getting his money's worth. I'm gettting *very* near my disk's max tested speed with Linux. He can run iozone on the disk device as well.