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Date: Wed, 29 Dec 2004 15:18:02 +0200
From: Pertti Kosunen <pertti.kosunen@pp.nic.fi>
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To: "Arno J. Klaassen" <arno@heho.snv.jussieu.fr>
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cc: freebsd-stable@freebsd.org
Subject: Re: TIMEOUT - WRITE_DMA - A possible FIX! turn off ACPI
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Arno J. Klaassen wrote:

>dunno, I'd more suspect ACPI<->APIC issues : untill now
>I only had problems on nForce based systems, but today I 
>installed a brand new VIA based A7VT mini-server and
>re-voila les "XXX_DMA" errors (and accompanying severe
>system slow-down).
>(Disk swapped from the old PII-233 minimalist-server; worked
>OK there; disabling APIC (in BOIS and/or config and/or hints)
>made disappear the XXX_DMA messages (and gave me my network
>connexion back ;) ) whilst ACPI still enabled).
>

No help here with ACPI or APIC disabled/enabled in any order.

First ata-channel works ok with 40GB & 120GB disks, but second channel 
with single 160GB disk has *_DMA issues. 160GB disk works ok at PIO4 mode.

Asus A7A266 motherboard with ALI chipset & Athlon 1333MHz processor.
FreeBSD 5.3-STABLE (&RELEASE)