Linux-kernel mailing list archive 1999-36,: Re: Problem allocating DMA memory

# Re: Problem allocating DMA memory

Rik van Riel (riel@humbolt.geo.uu.nl)
Mon, 6 Sep 1999 17:36:30 +0200 (CEST)

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On Mon, 6 Sep 1999, Alan Cox wrote:

> > > 2.2.11/2.2.12 have a zoned allocator which seems to help massively
> >
> > Nice and simple, I like it (and have overlooked it until now :().
> >
> > I think we should implement something at least this good in 2.3,
> > maybe even with cache colouring...
>
> Its simple, elegant but does need optimising. If you have little ram
> left but DMA ram your page allocation rate is noticably slower. On a
> 20Mb box thats not ideal.

We probably want to seperate the administration of DMA
and non-DMA memory so that we can easily see if we should
try or not.

Rik

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