Re: the new VMt

Oliver Xymoron
2000-09-25T17:31:38Z

On Mon, 25 Sep 2000, Alan Cox wrote:

> > > > Stupidity has no limits...
> > >
> > > Unfortunately its frequently wired into the hardware to save a few cents on
> > > scatter gather logic.
> >
> > Since when hardware folks became exempt from the rule above? 128K is
> > almost tolerable, there were requests for 64 _mega_bytes...
>
> Most cheap ass PCI hardware is built on the basis you can do linear 4Mb
> allocations. There is a reason for this. You can do that 4Mb allocation on
> NT or Windows 9x

Sure about that? It's been a while, but I seem to recall NT enforcing a
scatter-gather framework on all drivers because it only gave them virtual
allocations. For the cheaper cards, the s-g was done by software issuing
single span requests to the card.

--
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