Re: RFC: Very large allocations for 2.4.x
H. Peter Anvin (hpa@zytor.com)
28 Jun 2000 11:02:21 -0700
Followup to: <20000628100042.A3763@twiddle.net>
By author: Richard Henderson <rth@twiddle.net>
In newsgroup: linux.dev.kernel
>
> On Tue, Jun 27, 2000 at 01:10:09PM -0400, Jeff Garzik wrote:
> > Yes, I am aware that most applications -shouldn't- use this, but I am
> > hoping to convince the readers here that there is still a need to
> > support such allocations. To this end, I propose a simple but flexible
> > system. Comments requested.
>
> Any machine with an IOMMU needn't reserve contiguous physical memory,
> since the appearence of such can be fabricated.
>
I believe at least some AGP chipsets allow the use of the GART as an
IOMMU, even for PCI accesses.
*Sigh.* If they were going to put in an IOMMU, I wish they had done
it right. Somehow, that never seems to happen in the PC industry.
It's always hack upon kluge upon misfeature upon wart...
-hpa
--
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt
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