Documentation/ABI/removed/net_dma
What: tcp_dma_copybreak sysctl
Date: Removed in kernel v3.13
Contact: Dan Williams <dan.j.williams@intel.com>
Description:
Formerly the lower limit, in bytes, of the size of socket reads
that will be offloaded to a DMA copy engine. Removed due to
coherency issues of the cpu potentially touching the buffers
while dma is in flight.