RE: [PLUG] ATA100 vs ATA66

["Bob Razler" <bob@razler.com>]

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I am not sure what motherboard you have, but there is a bug in the
PCI bus on VIA boards.  You can read about it here:

http://www.tecchannel.de/hardware/817/index.html

That might be one reason for an overall slowdown of the bus.

Robert J. Razler, Esq.
Approvals Manager
Heritage Building Group, Inc.
Suite A-100
3326 Old York Road
Furlong, PA 18925
215.794.0550, ext. 117
www.heritagebuildinggroup.com
brazler@heritagebuildinggroup.com 

- -----Original Message-----
From: plug-admin@lists.phillylinux.org
[mailto:plug-admin@lists.phillylinux.org] On Behalf Of
epike@isinet.com
Sent: Thursday, January 03, 2002 10:01 AM
To: plug@lists.phillylinux.org
Subject: Re: [PLUG] ATA100 vs ATA66


did you try hdparm -I /dev/hdX and hdparm -i /dev/hdX to see
if theyre at the correct udma modes.  Personally I'd play
with hdparm especially the -d -W -c -X switches.  This varies
with the disk and controller (and could crash the disk if 
switched wrong).

on my computer I get readings with a promise ultra tx2 card of:

ultra 100 - peaks at around 24 mb/s
ultra 66  - around 12 mbs

also the linux I installed did not set it up optimally at boot,
so I had to put some hdparm statements in /etc/rc.d/rc.local
to speed up the disk manually.  You should be able to switch
hdparm -X69 for udma100 and -X68 for udma66.  But again that
depends on the disk & controller.

JOndZ






> 
> I got an ATA100 card to replace the ATA66, hoping to get the added
> advantage of the 30G ATA100 drive (2 drives, one is ATA100, the
> other ATA66). However, the hdparm readings indicate that the 
> buffered-cache reads decreased in efficiency and the buffered disk
> reads pretty much stayed the same.  
> 
> All I did was switch the cards. Should I have to reconfigure the
> kernel to load a different module? Does anyone have any experience
> doing this type of thing?
> 
> thanks
> 
> Chris 
> 
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