Date: Mon, 08 May 1995 14:51:27 -0700 From: "Justin T. Gibbs" <gibbs@estienne.CS.Berkeley.EDU> To: Tom Samplonius <tom@haven.uniserve.com> Cc: hackers@FreeBSD.org Subject: Re: Is a 486 fast enough for SCSI? Message-ID: <199505082151.OAA02666@estienne.cs.berkeley.edu> In-Reply-To: Your message of "Mon, 08 May 1995 12:26:33 PDT." <Pine.BSF.3.91.950508121705.2024B-100000@haven.uniserve.com>
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> > I've got a AMD486DX4100 with an Adaptec 2940 and two SCSI drives. When >I run iozone on one drive I get about 1.9MB/s, but when I run a iozone on >each drive I get about .9 MB/s (roughly half). Since the SCSI bus runs >at 10MB/s per second, the limiting factor appears to be the CPU? I >thought PCI devices required very little CPU time? > >Tom Do you have disconnection disabled on your devices? I don't see anywhere neer this kind of performance drop off on my 2742 with two drives (One drive is 5MB/s the other is 2MB/s). -- Justin T. Gibbs ============================================== TCS Instructional Group - Programmer/Analyst 1 Cory | Po | Danube | Volga | Parker | Torus ==============================================
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