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Date: Wed, 8 Dec 2004 07:20:26 -0800
From: Kris Kennaway <kris@obsecurity.org>
To: Rob <spamrefuse@yahoo.com>
Message-ID: <20041208152026.GA14279@xor.obsecurity.org>
References: <41B6F1AE.3000906@yahoo.com> <41B6F66B.9060708@yahoo.com>
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cc: FreeBSD <freebsd-questions@freebsd.org>
Subject: Re: Harddisk speed: PIO4 vs. UDMA66 controller ?
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On Wed, Dec 08, 2004 at 09:41:15PM +0900, Rob wrote:

> > ad0: 43979MB <IBM-DTLA-307045/TX6OA50C> [89355/16/63] at ata0-master PI=
O4
> > acd0: CDROM <CRD-8520B/1.00> at ata1-master PIO4
> >
> >The harddisk is very new and can do UDMA100. With a UDMA66 controller
> >I expect the harddisk to operate at least at 66 MB/sec. Any ideas why
> >the speed is only PIO4?
>=20
> I just realize that I have put in /boot/loader.conf:
>=20
>   hw.ata.ata_dma=3D"0"
>=20
> to prevent a WRITE_DMA panic at bootup.
> That's probably the reason why the harddisk speed is forced
> to PIO4, right?

Yes.

Kris

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