Garrett D'Amore writes: > NICs do this, although practical experience has shown that on modern > hardware the cost of setup and tear down for zero copy (direct DMA) > costs more than it takes to just bcopy an ethernet size frame. (Jumbo > Frames are entirely a different story, however.)
In my experience, this is true only on sparc, and even then only when DDI_DMA_FORCE_PHYSICAL isn't available (eg, you need to go through the pain and suffering of the iommu setup/teardown for each mapping). Drew _______________________________________________ networking-discuss mailing list [email protected]
