17bced397SDan WilliamsWhat: tcp_dma_copybreak sysctl 27bced397SDan WilliamsDate: Removed in kernel v3.13 37bced397SDan WilliamsContact: Dan Williams <dan.j.williams@intel.com> 47bced397SDan WilliamsDescription: 57bced397SDan Williams Formerly the lower limit, in bytes, of the size of socket reads 67bced397SDan Williams that will be offloaded to a DMA copy engine. Removed due to 77bced397SDan Williams coherency issues of the cpu potentially touching the buffers 87bced397SDan Williams while dma is in flight. 9