lkml.org 
[lkml]   [2007]   [Apr]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [Intel IOMMU][patch 8/8] Preserve some Virtual Address when devices cannot address entire range.
Date
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/

\
 
 \ /
  Last update: 2007-04-24 23:15    [W:0.967 / U:0.108 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site