Date: Wed, 13 Jul 2005 12:51:02 -0300 From: Gustavo De Nardin <gustavodn@gmail.com> To: freebsd-questions@freebsd.org Subject: Re: why CDROM operations cause system to be slow and HD operations do not Message-ID: <50af0a260507130851699caaa@mail.gmail.com> In-Reply-To: <42D4C8C9.1030401@tsoft.com> References: <42D4C8C9.1030401@tsoft.com>
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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)
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