linux-kernel - Re: 2.6.25 DMA: Out of SW-IOMMU space

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Date:	Sun, 24 Aug 2008 15:42:32 +0200
From:	Krzysztof Halasa <khc@...waw.pl>
To:	Jari Aalto <jari.aalto@...te.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.25 DMA: Out of SW-IOMMU space - Asus M2N32 AMD 8GB memory

Jari Aalto <jari.aalto@...te.net> writes:

>>>From Debian stock kernel:
>
> $ grep -Ei 'iommu|agp' /boot/config-2.6.25-2-amd64
> CONFIG_GART_IOMMU=y
> CONFIG_CALGARY_IOMMU=y
> CONFIG_CALGARY_IOMMU_ENABLED_BY_DEFAULT=y
> CONFIG_IOMMU_HELPER=y
> CONFIG_AGP=y
> CONFIG_AGP_AMD64=y
> CONFIG_AGP_INTEL=m
> CONFIG_AGP_SIS=m
> CONFIG_AGP_VIA=m

Should be fine. SWIOTLB is there for a backup, most (?) Intel machines
don't have IOMMU (even the newest desktop boards).

> Are these the correct boot options, without swiotlb?
>
>    iommu=noagp,noaperture,off
>
> Or just:
>
>    iommu=off

Do you have problems without "iommu=XXX"?
-- 
Krzysztof Halasa
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