Date: Sun, 2 Apr 1995 15:18:29 -0700 (PDT) From: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com> To: taob@gate.sinica.edu.tw (Brian Tao) Cc: freebsd-current@FreeBSD.org Subject: Re: New installation notes Message-ID: <199504022218.PAA02612@gndrsh.aac.dev.com> In-Reply-To: <Pine.BSI.3.91.950403005701.20912T-100000@aries.ibms.sinica.edu.tw> from "Brian Tao" at Apr 3, 95 01:29:09 am
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... > > >sailing once the kernel could recognize the Adaptec. I ran iozone to > > >check it out but it could only muster around 1.7MB/sec read/write > > >while my 486DX4/100 NCR-equipped system hits 2.5-2.6MB/sec. Both used > > > > Were you using the exact same drives? The best test would be to place > > the controllers in the same machine and test against the same exact drives. > > I'm been getting ~5MB/s out of the driver for some time now to a Quantum > > Empire 2100. > > The Pentium has twin Quantum Maverick 540's and my machine (with > the NCR controller) has a Quantum Empire 1080. I'll bring my drive up > to the Pentium and do another comparison. It is quite noticeably > slower for any heavy disk operations. Untarring the kernel source > dist and running config(8) are both noticeably faster on my 486. There is a very big difference between a Quantum Maverick 540 (3600 RPM, 14mS, 128k cache) and an Empire 1080 (5400RPM, 9.5mS, 512k cache). The two sets of numbers your reported above are very close to the maximum the drives can do. -- Rod Grimes rgrimes@gndrsh.aac.dev.com Accurate Automation Company Custom computers for FreeBSD
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