On Tue, Jul 10, 2007 at 12:24:02PM -0700, Roland Dreier wrote: > 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.
I thought that consistent only refers to physically contiguous area whereas coherent refers to memory where no barrier need to be used. But I may be wrong. Anyway, with my patch, I can turn off swiotlb and I'm still able to load ib_mthca cleanly in DomU. On the other hand, Xen bug me about DMA bug in ib_ipoib, there may be another problem with dma_sync_single(). > 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. OK, I will keep it for my own. -- Lukáš Hejtmánek _______________________________________________ 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
