Date: Mon, 8 May 1995 15:58:57 -0600 (MDT) From: Scott Mace <smace@metal-mail.neosoft.com> To: tom@haven.uniserve.com (Tom Samplonius) Cc: hackers@FreeBSD.org Subject: Re: Is a 486 fast enough for SCSI? Message-ID: <199505082158.PAA00426@metal.ops.neosoft.com> In-Reply-To: <Pine.BSF.3.91.950508121705.2024B-100000@haven.uniserve.com> from "Tom Samplonius" at May 8, 95 12:26:33 pm
next in thread | previous in thread | raw e-mail | index | archive | help
> > > 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? > The limiting time is the speed of the drive. I can get over 3megs/sec with my EISA bt747 and seagate barracuda drives. And my cpu is only a 486DX2-66. I'm never seen a single scsi drive actually do 10MB/sec. Scott
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199505082158.PAA00426>