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<       uint32_t		m_margin;
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<      m_margin		Drivers set this value to the amount
< 			of data in bytes that the device can
< 			transmit  beyond  m_max_sdu.   For
< 			example,  if  an Ethernet device can
< 			handle packets whose payload section
< 			is  no  greater  than 1522 bytes and
< 			m_max_sdu is set to  1500  (as
< 			is typical for Ethernet), then
< 			m_margin  is  set  to   22.
<