RT Linux and PCI bus

[Michel Doyon <doyon@speng.space.gc.ca>]

Hi,

I am looking for information of how to develop high performance 
software to interact with PCI data acquisition cards.

Although very simple to program, the ISA bus seems to have a lower
overhead especially when exchanging a few number of bytes each time, e.g.
A/D card. 

A similar card with a PCI bus interface seems in some cases slower.
Considering that a PCI bus is much faster than a ISA bus, I figure that I
must be missing some programming information to allow me to make fast
access to the pci bus.

Does any one have information or pointers to some information on how to
make best use of PCI bus with software and/or some references to
programming PCI bus.


I woul really appreciate some feedback.

Thank's in advance.


Michel
doyon@speng.space.gc.ca