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.)
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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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