1What: tcp_dma_copybreak sysctl 2Date: Removed in kernel v3.13 3Contact: Dan Williams <dan.j.williams@intel.com> 4Description: 5 Formerly the lower limit, in bytes, of the size of socket reads 6 that will be offloaded to a DMA copy engine. Removed due to 7 coherency issues of the cpu potentially touching the buffers 8 while dma is in flight. 9