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From: oreillym@tartarus.uwa.edu.au (Michael O'Reilly)
Newsgroups: comp.unix.bsd,comp.os.linux
Subject: Re: IDE faster than SCSI-2
Date: 7 Nov 1992 09:50:50 +0800
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References: <1992Nov5.080716.10386@ntuix.ntu.ac.sg>
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Othman Ahmad (eoahmad@ntuix.ntu.ac.sg) wrote:
: I posted an iozone benchmark using my 386/25Mhz machine which shows that
: it is slightly slower than a SCSI-2 hard-disk. Now with a 486/33, IDE is
: definitely faster than a EISA SCSI-2 486/50MHZ hard-disk.
: Iozone uses normal unix system calls for writing to disks, after all,
: that is how we write C programs.
: I may try to run a more sophisticated file system tester called
: bi? later on.
:
:
: JUlian's machine
: is a 50MHz EISA 486 with a 1.3GB drive attached via a Bustek 742a SCSI2
: adapter. It has 16MB of ram. Part of the disk (about 200MB is taken up
: by mach2.6 and is unavailable to 386bsd.
:
: I checked the load on this machine, it is very light. There is only another
: user apart from I.
:
: iozone 1
:
: Writing the 1 Megabyte file, 'iozone.tmp'...1.766667 seconds
^
^ This is useless. It tells no-one anything. A one meg
file should fit entirely in the cache. So unless BSD is braindead, and
doesn't cache (which I doubt), then you have just measured the cache
speed. On my 486/33, 8 meg ram, a 1 meg files get 10 megs per second.
The disk is never accessed, unless a sync kicks in 1/2 way though.
I don't know exactly what you measured, but it sure ain't disk speed.
: Othman bin Ahmad, School of EEE,
:
Michael