On Tue, Nov 22, 2011 at 11:54:22AM -0500, Jean-Francois Dagenais wrote: > That is quite interesting. It really seems like my VT-d recipe to create 128MB for my PCI-e > FPGA to write into is covered by this patch. > > My problem is that our FPGA is connected to one of the atom E6XX's PCI-e links, so no > iommu :( Since our first product had VT-d, the FPGA, uio based module and userspace > code is designed such that the device sees a huge contiguous memory chunk. This is key > to the performance of the FPGA, which is essentially decoupled from the CPU for it's real-time > acquisition. Is it really key? If you supported, ohidon'tknow, 2MB pages, you'd need 64 entries in the FPGA to store the addresses of those 2MB pages, which doesn't sound like a huge burden. -- Matthew Wilcox Intel Open Source Technology Centre "Bill, look, we understand that you're interested in selling us this operating system, but compare it to ours. We can't possibly take such a retrograde step." -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
