*BSD News Article 12950


Return to BSD News archive

Newsgroups: comp.os.386bsd.bugs
Path: sserve!newshost.anu.edu.au!munnari.oz.au!news.Hawaii.Edu!ames!haven.umd.edu!uunet!mnemosyne.cs.du.edu!nyx!smace
From: smace@nyx.cs.du.edu (Scott Mace)
Subject: Re: IOZONE results
Message-ID: <1993Mar18.211720.5548@mnemosyne.cs.du.edu>
X-Disclaimer: Nyx is a public access Unix system run by the University
	of Denver for the Denver community.  The University has neither
	control over nor responsibility for the opinions of users.
Sender: usenet@mnemosyne.cs.du.edu (netnews admin account)
Organization: Nyx, Public Access Unix at U. of Denver Math/CS dept.
References: <C43MBo.3owM@austin.ibm.com>
Date: Thu, 18 Mar 93 21:17:20 GMT
Lines: 38

In article <C43MBo.3owM@austin.ibm.com> fredriks@austin.ibm.com (Lars Fredriksen) writes:
>
>Hi,
>	This is not a bug per se, as much as a request to see what
>other people are seeing.
>
>	I ran iozone auto on my machine and got the maximum of 500K/s
>throughtput. I saw a report from someone running Interactive Unix on
>a 50MHz 486 with a Bustek controller getting 4.5M/s.

500K/s is average for a SCSI-1 asynchronous device.  You didn't metion
what kind of drive they were using when it tested at 4.5M/s.  Also
Interactive Unix may be using a large buffer cache as well.  

>
>	My machine is a 33MHz 486 with 128K of cache, 16Mb of Memory,
>	with an Adaptec 174x controller. I have Julians scsi drivers,
>	and the drive is supposed to be capable of 5M/s.

Are you running the drive in synchronous mode? 

>
>Anyone have a clue to why I am seeing a factor of 10 difference?  


I have a 386-33 and a Adaptec 1542B. Coupled with a maxtor LXT-340s
SCSI-2 drive I get about 1000-1100K/s.  The spec for my drive says it
will run up to 20 Mbits/s or about 2.5M/s.  With a Seagate st-1096N
SCSI-1 drive I get about 400-500K/s.  If your drive is if fact capable
of running at 5Megabytes/sec then you must have a hardware setup
problem.

Scott Mace
--
*********************************************************************
*    Scott Mace                internet:    smace@nyx.cs.du.edu     *
*                                           emace@tenet.edu         *
*********************************************************************