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Date: Sat, 1 Dec 2001 11:13:31 +0100
From: Miklos Niedermayer <mico@bsd.hu>
To: Greg Lehey <grog@FreeBSD.org>
Cc: freebsd-hackers@FreeBSD.ORG
Subject: Re: FreeBSD performing worse than Linux?
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References: <20011128153817.T61580@monorchid.lemis.com> <15364.38174.938500.946169@caddis.yogotech.com> <20011128104629.A43642@walton.maths.tcd.ie> <5.1.0.14.1.20011130181236.00a80160@postamt1.charite.de> <200111302047.fAUKlT811090@apollo.backplane.com> <3C07FCFF.4070008@ns.aus.com> <20011201140741.J611@monorchid.lemis.com>
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Hi,

On Sat, Dec 01, 2001 at 02:07:41PM +1030, Greg Lehey wrote:

> > so my drive is now running at UDMA 100.
> 
> Can you send me dmesg output?  In particular, I had a printf output
> there to show what the BIOS had set.
> 
> Background for other people: Richard has an IDE chip which claims to
> be a SiS 5591, which according to the data sheet can't do better than
> UDMA 33.  When he runs Linux on the box, however, it claims to be
> running at UDMA 100, and this hack seems to have had the same effect.

Is this patch available somewhere, or could you send it to me?  I have the
same chipset on an Asus Athlon mobo:

atapci0: <SiS 5591 ATA33 controller> port 0xd800-0xd80f at device 0.1 on pci0

And yes, Linux can run it at UDMA100, and the printed datasheet of the
board says it's an UDMA100-capable chip. (The SiS doc says UDMA33).


Thanks

                                         ______  o _. __
                                         / / / (_(_(__(_)  @ bsd.hu


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