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From: taob@gate.sinica.edu.tw (Brian Tao)
Newsgroups: comp.periphs.scsi,comp.os.linux.hardware,comp.unix.bsd.freebsd.misc,comp.os.linux.setup
Subject: Re: SCSI PCI host adapter
Date: 31 Aug 1995 09:54:36 GMT
Organization: Institute of Biomedical Sciences, Academia Sinica
Lines: 18
Message-ID: <4240ss$ccv@gate.sinica.edu.tw>
References: <418r3m$9c6@trauma.rn.com> <41sjek$rtu@bonnie.tcd-dresden.de> <1995Aug29.125909.28500@wavehh.hanse.de> <shimon.809740893@ark>
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Xref: euryale.cc.adfa.oz.au comp.periphs.scsi:36313 comp.os.linux.hardware:14327 comp.unix.bsd.freebsd.misc:5126 comp.os.linux.setup:18298
In article <shimon.809740893@ark>, Simon Shapiro <shimon@ssd.intel.com> wrote:
>
>2. Interesting that CPU utilization is 85-99%. Does not leave much to other
> things.
Only for the putc/getc-based IO. Writing 1.5 to 1.8 million
characters per second will tax the capabilities of most CPU's. ;-)
Block IO (which is what you'll see in the real world) is significantly
less than 50% at maximum throughput.
>3. Where is the 8MB/Sec reported in this thread? I saw 1.5 or so.
Maybe as an aggregate throughput figure in a multi-disk benchmark.
Figures around (perhaps exceeding?) 20MB/sec are achievable under
FreeBSD given enough disk and controllers. :)
--
Brian ("Though this be madness, yet there is method in't") Tao
taob@gate.sinica.edu.tw <-- work ........ play --> taob@io.org