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Message-ID: <3AB67F7C.34E093F8@bigfoot.com>
Date: Mon, 19 Mar 2001 13:51:56 -0800
From: Tim Moore <timothymoore@bigfoot.com>
Organization: Yoyodyne Propulsion Systems, Inc.
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To: linux-kernel@vger.kernel.org
Subject: Re: UDMA 100 / PIIX4 question
In-Reply-To: <Pine.LNX.4.10.10103191448010.5246-100000@coffee.psychology.mcmaster.ca>
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Mark Hahn wrote:
> 
> > > > I have an IBM DTLA 307030 (ATA 100 / UDMA 5) on an 815e board (Asus CUSL2), which has a PIIX4 controller.
> > > > ...
> > > > My problem is that (according to hdparm -t), I never get a better transfer rate than approximately 15.8 Mb/sec....
> > >
> > > 15MB/s for hdparm is about right.
> 
> it's definitely not right: this disk sustains around 35 MB/s.

The 815e does not use a PIIX4 chipset.  My references were to PIIX4
chipsets.

> nonsequitur: the controller and disk are both quite capable of
> sustaining 20-35 MB/s (depending on zone.)  here's hdparm output
> for a disk of the same rpm and density as the DTLA's:
> 
>  Timing buffer-cache reads:   128 MB in  1.07 seconds =119.63 MB/sec
>  Timing buffered disk reads:  64 MB in  2.02 seconds = 31.68 MB/sec
> 
> (maxtor dm+45, hpt366 controller)
> regards, mark hahn.

Again, this is not a PIIX4 chipset.

rgds,
tim.
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