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From: Luigi Rizzo <luigi@labinfo.iet.unipi.it>
Message-Id: <199603091125.MAA15243@labinfo.iet.unipi.it>
Subject: Re: IDE performance
To: avalon@coombs.anu.edu.au (Darren Reed)
Date: Sat, 9 Mar 1996 12:25:55 +0100 (MET)
Cc: StevenR362@aol.com, hackers@FreeBSD.org
In-Reply-To: <199603090706.IAA14976@labinfo.iet.unipi.it> from "Darren Reed" at Mar 9, 96 06:11:59 pm
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> Hmm, I don't know how useful iozone is for testing raw disk io, but with
> dd, I can get a reasonable indication:
> 
> wdc0 at 0x1f0-0x1f7 irq 14 flags 0x80ff80ff on isa
> wdc0: unit 0 (wd0): <WDC AC2850F>, 32-bit, multi-block-16
> wd0: 814MB (1667232 sectors), 1654 cyls, 16 heads, 63 S/T, 512 B/S
> wdc0: unit 1 (atapi): <MATSHITA CR-581/1.07>, removable, accel, iordis
> wcd0: 689Kb/sec, 128Kb cache, audio play, 256 volume levels, ejectable tray
> wcd0: medium type unknown, unlocked
> wdc1 at 0x170-0x177 irq 15 flags 0x80ff80ff on isa
> wdc1: unit 0 (wd2): <WDC AC31600H>, 32-bit, multi-block-16
> wd2: 1549MB (3173184 sectors), 3148 cyls, 16 heads, 63 S/T, 512 B/S
> 
> I wonder, can the CD-ROM's presence slow down the entire bus ?

Don't think so. I get top speed when the drive is on the same cable as
the CDROM. I believe that the 850MB disk is slower (as it is the 1GB
unit compared to the 1.6GB model).

	Luigi
====================================================================
Luigi Rizzo                     Dip. di Ingegneria dell'Informazione
email: luigi@iet.unipi.it       Universita' di Pisa
tel: +39-50-568533              via Diotisalvi 2, 56126 PISA (Italy)
fax: +39-50-568522              http://www.iet.unipi.it/~luigi/
====================================================================