The value of tHsmdaSlopeHiMaxProbability specifies the drop
probability, as a percentage, when the Hsmda queue depth reaches
tHsmdaSlopeHiMaxDepth. The drop increases steadily from 0 at
the tHsmdaSlopeHiStartDepth up to the tHsmdaSlopeHiMaxProbability
at the tHsmdaSlopeHiMaxDepth.