> > coherent and consistent are synonyms. It's confusing because there is > > pci_alloc_consistent(), which is in general just a wrapper for > > dma_alloc_coherent(). > > According to DMA-mapping.txt they are not. Alpha, M68000 wihtout MMU, PPC, > Sparc, Sparc64, V850 have own implementation of pci_alloc_consistent(). > > Yes, on i386, the pci_alloc_consistent() is just wrapper for > dma_alloc_coherent().
Sorry, I was a little confusing. The implementations may be different but in general there is no real difference between consistent and coherent memory. Using either pci_alloc_consistent() or dma_alloc_coherent() will exhaust the same small pool of address space on powerpc 4xx for example. > So, what about some #ifdefs ? E.g., allow config option - Xen optimizations? Seems pretty ugly, especially given that Xen is not upstream. I think the Xen tree should just carry such patches, at least until Xen is merged. Even then I'm quite dubious about having two code paths for this. - R. _______________________________________________ general mailing list [email protected] http://lists.openfabrics.org/cgi-bin/mailman/listinfo/general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
