[openib-general] basic IB doubt

[Jason Gunthorpe]

On Mon, Aug 28, 2006 at 10:38:43AM -0400, Talpey, Thomas wrote:

> Will turning on the Opteron's IOMMU introduce some of these
> issues to x86?

No, definately not. The Opteron IOMMU (the GART) is a pure address
translation mechanism and doesn't change the operation of the caches.

If Sun has a problem on larger systems I wonder if SGI Altix also has a
problem? SGI Altix is definately a real system that people use IB
cards in today and it would be easy to imagine such a large system
could have coherence issues with memory polling..

Jason