Re: [Intel IOMMU][patch 8/8] Preserve some Virtual Address when devices cannot address entire range.

Andi Kleen
2007-04-25T06:57:19Z

On Wednesday 25 April 2007 03:12:51 H. Peter Anvin wrote:

> You can probably find almost any possible bitmask if you look long
> enough. Hardware vendors are notorious for this kind of "optimizations".

The nice thing is if this was solved in the IOMMU code then we could drop
(or not initialize) GFP_DMA on systems with that hardware. I guess GFP_DMA32
would still need to stay for the graphics devices though.

Not sure how much difference it would make though, but at least Christoph Lameter
seems to think it would.

-Andi