Re: [PATCH] Intel x86-64 support merge

[Jeff Garzik]

Bill Davidsen wrote:
> David Mosberger-Tang wrote:
>
> > > > > > > On Thu, 19 Feb 2004 00:40:24 +0100, Arjan van de Ven 
> > > > > > > <arjan@xxxxxxxxxxxxxxx> said:
> >
> >
> >
> >   Arjan> On Wed, 2004-02-18 at 23:57, H. Peter Anvin wrote:
> >   >>  Because they were caught by surprise and just hacked the chips
> >   >> they had in the pipeline, presumably.
> >
> >   Arjan> fair enough; I hope this means the next generation has this
> >   Arjan> wart fixed...
> >
> > I wouldn't hold my breath.  My impression was that the Intel chipset
> > folks don't want I/O MMU because (a) Windows doesn't need it and (b)
> > real machines use (close-to-)64-bit-capable hardware.
>
>
> Doesn't need it? Does that mean the Win64 uses bounce buffers for 
> everything? Or am I totally misreading this?


Well, for 32-bit PCI hardware on a 64-bit OS, you pretty much have to 
bounce, without an IOMMU.

I doubt Win64 bounces for 64-bit PCI hardware, but who knows...

	Jeff



-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/