Messages in this thread | | | From | Andi Kleen <> | Subject | Re: [Intel IOMMU][patch 8/8] Preserve some Virtual Address when devices cannot address entire range. | Date | Tue, 24 Apr 2007 23:12:54 +0200 |
| |
On Tuesday 24 April 2007 22:33:04 Ashok Raj wrote:
> With PCIE there is some benefit to keep dma addr low for performance reasons, > since it will use 32bit Transaction level packets instead of 64bit. > > This reservation is only required if we have some legacy device under a p2p > where its required to share its addr space with other devices. We could > implement a default when one is not specified to keep things simple.
We already have a couple of other IOMMU architectures who essentially have the same problem. Have you checked how they solve this?
-Andi
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |