lkml.org 
[lkml]   [2008]   [Jun]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 01/34] AMD IOMMU: add Kconfig entry
On Fri, Jun 27, 2008 at 07:40:35PM +0200, Joerg Roedel wrote:

> Yes. As I said, this is for the non-isolating case. For the
> isolation case (which is needed for protection) it is harder to
> optimize. But there I think about some sort of lazy IOMMU TLB
> flushing. The flushing and 'wait for the flush to finish' is the
> most expensive part in the mapping and unmapping code path. But this
> needs some experiments.

Agreed. The paper I just posted to the iommu mailing list has some
ideas and experimental data.

> > I am thinking of them and I'd be surprised if you'd find any in
> > such machines. Certainly I assume none of the on-board devices
> > will have this ancient limitation. But hey, it could happen ;-)
>
> The IOMMU machine under my desk has a 32bit PCI slot with a card in
> it :-)

Touche :-)

Cheers,
Muli


\
 
 \ /
  Last update: 2008-06-27 19:47    [W:0.181 / U:0.476 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site