Date: Thu, 17 Oct 1996 19:19:46 -0700 From: "Michael L. VanLoon -- HeadCandy.com" <michaelv@MindBender.serv.net> To: asami@freebsd.org (Satoshi Asami) Cc: scrappy@ki.net, michaelh@cet.co.jp, mrcpu@cdsnet.net, current@freebsd.org Subject: Re: Iozone: local vs nfs drives Message-ID: <199610180219.TAA14144@MindBender.serv.net> In-Reply-To: Your message of Thu, 17 Oct 96 16:40:04 -0700. <199610172340.QAA13043@sunrise.cs.berkeley.edu>
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> * Did you have tagged-command queuing enabled? According to my tests, > * that will make a BIG difference, if you have decent drives. >I haven't seen tagged-queueing make much difference for reads. These >are the kind of numbers we've seen before (off the top of my head): > w/o tag with tag > W R W R >Quantum Atlas 6 7 6 7 >Seagate 'Cuda 4 6 6 7 OK, you're right. And, my tests were with a Barracuda (2GB, about 45% full), as well. Still, it DID make a big difference for writes. Also, this was under NetBSD, but the results should be very similar: W R BT956c (no TCQ) 1.5 6.1 2940UW (no TCQ) 1.5 5.0 2940UW (TCQ) 4.5 6.4 (On a Pentium 120MHz, 64MB EDO RAM, NetBSD 1.2, narrow 2GB Seagate Barracuda.) ----------------------------------------------------------------------------- Michael L. VanLoon michaelv@MindBender.serv.net --< Free your mind and your machine -- NetBSD free un*x >-- NetBSD working ports: 386+PC, Mac 68k, Amiga, Atari 68k, HP300, Sun3, Sun4/4c/4m, DEC MIPS, DEC Alpha, PC532, VAX, MVME68k, arm32... NetBSD ports in progress: PICA, others... -----------------------------------------------------------------------------
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