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Date: Wed, 13 Jul 2005 12:51:02 -0300
From: Gustavo De Nardin <gustavodn@gmail.com>
To: freebsd-questions@freebsd.org
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References: <42D4C8C9.1030401@tsoft.com>
Subject: Re: why CDROM operations cause system to be slow and HD operations
	do not
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On 13/07/05, Yuri <yuri@tsoft.com> wrote:
> When I read something from CDROM my system gets visibly slow and HD
> reads/writes do not have the same effect.

By default:
hw.ata.ata_dma: 1        <--- affects HD
hw.ata.atapi_dma: 0      <--- affects CD

So:
# atacontrol mode 0
Master =3D UDMA100   <--- HD
Slave  =3D BIOSPIO
# atacontrol mode 1
Master =3D BIOSPIO   <--- CD
Slave  =3D PIO4

Put 'hw.ata.atapi_dma=3D1' in /boot/loader.conf to get the CDROM using
DMA on the next boot; use atacontrol to turn DMA mode at runtime.

--=20
(nil)