On Wed, 4 Feb 2004, Marc Aurele La France wrote:
> On 4 Feb 2004, John Dennis wrote:
>
> > On Tue, 2004-02-03 at 17:37, Marc Aurele La France wrote:
> > > PCI-Xpress is programmatically identical to PCI, so I don't forsee any
> > > problems in that regard.
>
> > Yes, its identical to PCI in terms of the interface presented to the OS
> > so configuration probably won't be an issue, but there is code in
> > hw/xfree86/os-support/bus that attempts to walk the bus topology with
> > explicit knowledge of current PCI bridges. I don't believe this code
> > will execute correctly, but I assume it can be easily defeated, yes?
>
> > But thats probably less of an issue than the fact PCIE systems demand
> > new PCIE cards and that means driver support. If we are fortunate the
> > new PCIE cards might be pragmatically compatible with with current cards
> > and XFree86 will only need to recognize the new cards, but I really
> > doubt that will be the case. ATI, nvidia, 3DLabs have all announced
> > support for PCIE and pledged it will bring dramatic performance
> > increases. Some of that will be due to the faster bus, but I've got to
> > believe these new cards will feature architectural changes as well
> > demanding new driver support.
>
> > Bottom line, I've been asked if XFree86 will be able to support PCIE
> > systems due to arrive in a few months or if these systems are going to
> > be dead in the water for open source for anything other than a server.
>
> > So I'm digging for what people know or believe the issues are.
>
> At the risk of being flippant: Try it. Actual problems are always easier
> to debug than theoritical ones.
>
> Marc.
I've been told that it works, but PCI Express performance is poor
on Linux. But that could be for any number of reasons. Certainly,
the sky is not falling. People are expected to get things to work.
Whether performance meets expectations is another matter.
Mark.
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