Re: [PATCH] [2/2] POWERPC: Lower threshold for DART enablement to 1GB, V2

[Olof Johansson]

On Thu, Apr 13, 2006 at 09:40:27AM +0300, Muli Ben-Yehuda wrote:
> On Wed, Apr 12, 2006 at 09:52:33PM -0500, Olof Johansson wrote:
> 
> > iommu=off can still be used for those who don't want to deal with the
> > overhead (and don't need it for any devices).
> 
> I've been pondering walking the PCI bus before deciding to enable an
> IOMMU and checking each device's DMA mask. Is this something that you
> considered and rejected, or just something no one got around to doing?

It's something I thought about, but right now we enable the IOMMU quite
early during boot. It'd take a bit of surgery to shuffle things, and I
decided that it's not worth the work (and risk of regressions) for 2.6.17.



-Olof
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