- Use more appropriate maxsize, nsegments and maxsegsize parameters   when creating the parent bus DMA tag. While at it correct the style   and a nearby comment. - Take advantage of m_collapse(9) for performance reasons.
- Use more appropriate maxsize, nsegments and maxsegsize parameters
  when creating the parent bus DMA tag. While at it correct the style
  and a nearby comment.
- Take advantage of m_collapse(9) for performance reasons.

MFC after:	2 weeks

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase