On Wed, Jun 19, 2013 at 9:28 AM, Jon Mason <jon.ma...@intel.com> wrote: > On Tue, Jun 18, 2013 at 06:13:28PM -0700, Dan Williams wrote: [..] > NTB is currently using it to flush any pending DMAs. This is needed > to allow the DMA engine and the CPU to perform operations on the same > "Memory Window". Without this, it is possible for the operations to > complete out of order, which is not a desired outcome for any network > traffic over NTB. CPU is preferred over DMA engine for small > transfers. Also, it provides an alternative for errors in the DMA > engine copy process (e.g., DMA mapping, device_prep_dma_memcpy, and > dmaengine_submit).
Ok there really isn't a better alternative, is NTB always polling or does it also use completion callbacks? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
