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I/OAT DMA performance tuning showed different optimal values of tcp_dma_copybreak for different I/OAT versions (4096 for 1.2 and 2048 for 2.0). This patch lets ioatdma driver set tcp_dma_copybreak value according to these results. [dan.j.williams@intel.com: remove some ifdefs] Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>