Re: (reposting) how to get DMA'able memory within 4GB on 64-bit m achi ne

From: David S. Miller (
Date: Thu Jun 28 2001 - 17:29:18 EST

Ben LaHaise writes:
> On Thu, 28 Jun 2001, David S. Miller wrote:
> > Please note that this is nonstandard and undocumented behavior.
> >
> > This is not a supported API at all, and the way 64-bit DMA will
> > eventually be done across all platforms is likely to be different.
> Well, what is the standard API to use? All these 64 bit cards in my
> machine really make that 95% cpu usage in bounce buffer copying rather
> depressing.

There simply is no standard API for 64-bit DAC, sorry.

This isn't changing in 2.4.x, please face facts. It simply is not
a feature of 2.4.x, and we are well beyond feature freeze now.

It is certainly changing in 2.5.x which is just around the corner.

David S. Miller
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