The maximum latency acceptable for a reserved flow packet. This
parameter limits the amount of unreserved data that the link
scheduler can put onto the driver transmit ring. When the data on
the transmit ring reaches a size where additional unreserved data
would take longer than the value of this parameter to clock out, no
more data will be enqueued.
Reduce this parameter to obtain better delay characteristics for
reserved flows, but note that this will result in somewhat reduced
overall throughput. Units are milliseconds.