The number of times that the switch was unable to obtain
a packet buffer. Failure to obtain a buffer indicates
that buffers were busy. This parameter is directly
related to hpPktBufMin. If hpPktBufMiss is greater than 0,
hpPktBufMin must equal 0. Conversely, if hpPktBufMiss
equals 0, then hpPktBufMin must be greater than 0.